{"id":4420,"date":"2016-05-16T09:49:00","date_gmt":"2016-05-16T04:19:00","guid":{"rendered":"http:\/\/mycbseguide.com\/blog\/ncert-solutions-class-12-physics-electrostatic-potentia-and-capacitance-part-2\/"},"modified":"2018-10-22T15:24:57","modified_gmt":"2018-10-22T09:54:57","slug":"ncert-solutions-class-12-physics-electrostatic-potentia-and-capacitance","status":"publish","type":"post","link":"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-12-physics-electrostatic-potentia-and-capacitance\/","title":{"rendered":"NCERT Solutions class 12 physics Electrostatic Potentia and Capacitance Part 2"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_76 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-12-physics-electrostatic-potentia-and-capacitance\/#NCERT_Class_12_Physics_Chapter-wise_Solutions\" >NCERT Class 12 Physics Chapter-wise Solutions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-12-physics-electrostatic-potentia-and-capacitance\/#CHAPTER_2_ELECTROSTATIC_POTENTIAL_AND_CAPACITANCE\" >CHAPTER 2 ELECTROSTATIC POTENTIAL AND CAPACITANCE<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-12-physics-electrostatic-potentia-and-capacitance\/#NCERT_Solutions_class_12_physics_Electrostatic_Potentia_and_Capacitance_Part_2\" >NCERT Solutions class 12 physics Electrostatic Potentia and Capacitance Part 2\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-12-physics-electrostatic-potentia-and-capacitance\/#NCERT_Solutions_for_Class_12_Physics\" >NCERT Solutions for Class 12 Physics<\/a><\/li><\/ul><\/nav><\/div>\n<p>NCERT Solutions class 12 physics Electrostatic Potentia and Capacitance Part 2 Class 12 Physics book solutions are available in PDF format for free download. These ncert book chapter wise questions and answers are very helpful for CBSE board exam. CBSE recommends NCERT books and most of the questions in CBSE exam are asked from NCERT text books. Class 12 Physics chapter wise NCERT solution for Physics part 1 and Physics part 2 for all the chapters can be downloaded from our website and myCBSEguide mobile app for free.<\/p>\n<p style=\"text-align: center;\"><strong>Download\u00a0<a href=\"https:\/\/mycbseguide.com\/downloads\/cbse-class-12-physics\/1251\/ncert-solutions\/5\/\">NCERT solutions for\u00a0Electrostatic Potentia and Capacitance Part 2 \u00a0<\/a>as PDF.<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignright\" src=\"https:\/\/media-mycbseguide.s3.ap-south-1.amazonaws.com\/images\/blog\/Class%2012%20physics%20book%2012.jpg\" alt=\"NCERT Solutions class 12 physics Electrostatic Potentia and Capacitance Part 2\" width=\"130\" height=\"159\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"NCERT_Class_12_Physics_Chapter-wise_Solutions\"><\/span><strong>NCERT Class 12 Physics Chapter-wise Solutions<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>1 \u2013 Electric Charges and Fields<\/li>\n<li>2 \u2013 Electrostatic Potential and Capacitance<\/li>\n<li>3 \u2013 Current Electricity<\/li>\n<li>4 \u2013 Moving Charges and Magnetism<\/li>\n<li>5 \u2013 Magnetism and Matter<\/li>\n<li>6 \u2013 Electromagnetic Induction<\/li>\n<li>7 \u2013 Alternating Current<\/li>\n<li>8 \u2013 Electromagnetic Waves<\/li>\n<li>9 \u2013 Ray Optics and Optical Instruments<\/li>\n<li>10 \u2013 Wave Optics<\/li>\n<li>11 \u2013 Dual Nature of Radiation and Matter<\/li>\n<li>12 \u2013 Atoms<\/li>\n<li>13 \u2013 Nuclei<\/li>\n<li>14 \u2013 Semiconductor Electronic: Material, Devices and Simple Circuits<\/li>\n<li>15 \u2013 Communication Systems<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"CHAPTER_2_ELECTROSTATIC_POTENTIAL_AND_CAPACITANCE\"><\/span>CHAPTER 2 ELECTROSTATIC POTENTIAL AND CAPACITANCE<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>2.1 Introduction<\/li>\n<li>2.2 Electrostatic Potential<\/li>\n<li>2.3 Potential due to a Point Charge<\/li>\n<li>2.4 Potential due to an Electric Dipole<\/li>\n<li>2.5 Potential due to a System of Charges<\/li>\n<li>2.6 Equipotential Surfaces<\/li>\n<li>2.7 Potential Energy of a System of Charges<\/li>\n<li>2.8 Potential Energy in an External Field<\/li>\n<li>2.9 Electrostatics of Conductors<\/li>\n<li>2.10 Dielectrics and Polarisation<\/li>\n<li>2.11 Capacitors and Capacitance<\/li>\n<li>2.12 The Parallel Plate Capacitor<\/li>\n<li>2.13 Effect of Dielectric on Capacitance<\/li>\n<li>2.14 Combination of Capacitors<\/li>\n<li>2.15 Energy Stored in a Capacitor<\/li>\n<li>2.16 Van de Graaff Generator<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"NCERT_Solutions_class_12_physics_Electrostatic_Potentia_and_Capacitance_Part_2\"><\/span>NCERT Solutions class 12 physics Electrostatic Potentia and Capacitance Part 2<strong>\u00a0<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\">20: \u00a0Two charged conducting spheres of radii a and b are connected to each other by a wire. What is the ratio of electric fields at the surfaces of the two spheres? Use the result obtained to explain why charge density on the sharp and pointed ends of a conductor is higher than on its flatter portions.<\/p>\n<p>21: Two charges <img decoding=\"async\" style=\"height: 21px; width: 82px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch02\/image239.png\" \/>\u00a0are located at points <img decoding=\"async\" style=\"height: 27px; width: 170px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch02\/image240.png\" \/>\u00a0\u00a0respectively.<\/p>\n<p>1. What is the electrostatic potential at the points?<\/p>\n<p>2. Obtain the dependence of potential on the distance r of a point from the origin when r\/a &gt;&gt; 1.<\/p>\n<p style=\"text-align: justify;\">3. How much work is done in moving a small test charge from the point (5, 0, 0) to <img decoding=\"async\" style=\"height: 27px; width: 73px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch02\/image241.png\" \/>\u00a0along the x-axis? Does the answer change if the path of the test charge between the same points is not along the x-axis?<\/p>\n<p style=\"text-align: justify;\">22: \u00a0Figure 2.34 shows a charge array known as an electric quadrupole. For a point on the axis of the quadrupole, obtain the dependence of potential on r for r\/a &gt;&gt; 1, and contrast your results with that due to an electric dipole, and an electric monopole (i.e., a single charge).<\/p>\n<p><img decoding=\"async\" id=\"Picture 107\" style=\"height: 50px; width: 202px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch02\/image256.jpg\" alt=\"image\" \/><\/p>\n<p style=\"text-align: justify;\">23: \u00a0An electrical technician requires a capacitance of <img decoding=\"async\" style=\"height: 21px; width: 33px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch02\/image274.png\" \/>\u00a0in a circuit across a potential difference of 1 kV. A large number of 1 \u00c2\u00b5F capacitors are available to him each of which can withstand a potential difference of not more than 400 V. Suggest a possible arrangement that requires the minimum number of capacitors.<\/p>\n<p style=\"text-align: justify;\">24: \u00a0What is the area of the plates of a 2 F parallel plate capacitor, given that the separation between the plates is 0.5 cm? [You will realize from your answer why ordinary capacitors are in the range of <img decoding=\"async\" style=\"height: 21px; width: 25px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch02\/image286.png\" \/>\u00a0or less. However, electrolytic capacitors do have a much larger capacitance (0.1 F) because of very minute separation between the conductors.]\n<p>25: Obtain the equivalent capacitance of the network in Fig. 2.35. For a 300 V supply, determine the charge and voltage across each capacitor.<\/p>\n<p>26: The plates of a parallel plate capacitor have an area of 90<img decoding=\"async\" style=\"height: 21px; width: 32px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch02\/image336.png\" \/>each and are separated by 2.5 mm. The capacitor is charged by connecting it to a 400 V supply.<\/p>\n<p><strong><img decoding=\"async\" id=\"Picture 123\" style=\"height: 117px; width: 131px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch02\/image337.jpg\" alt=\"image\" \/><\/strong><\/p>\n<p>1. How much electrostatic energy is stored by the capacitor?<\/p>\n<p>2. View this energy as stored in the electrostatic field between the plates, and obtain the energy per unit volume u. Hence arrive at a relation between u and the magnitude of electric field E between the plates.<\/p>\n<p style=\"text-align: justify;\">27: \u00a0A 4 <img decoding=\"async\" style=\"height: 21px; width: 25px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch02\/image357.png\" \/>\u00a0capacitor is charged by a 200 V supply. It is then disconnected from the supply, and is connected to another uncharged 2<img decoding=\"async\" style=\"height: 21px; width: 25px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch02\/image358.png\" \/>\u00a0 capacitor. How much electrostatic energy of the first capacitor is lost in the form of heat and electromagnetic radiation?<\/p>\n<p style=\"text-align: justify;\">28: \u00a0Show that the force on each plate of a parallel plate capacitor has a magnitude equal to (<img decoding=\"async\" style=\"height: 19px; width: 15px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch02\/image369.png\" \/>\u00a0) QE, where Q is the charge on the capacitor, and E is the magnitude of electric field between the plates. Explain the origin of the factor<img decoding=\"async\" style=\"height: 19px; width: 15px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch02\/image369.png\" \/>\u00a0.<\/p>\n<p>29: A spherical capacitor consists of two concentric spherical conductors, held in position by suitable insulating supports (Fig. 2.36).<\/p>\n<p><strong><img decoding=\"async\" id=\"Picture 164\" style=\"height: 112px; width: 147px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch02\/image382.jpg\" alt=\"image\" \/><\/strong><\/p>\n<p>Show that the capacitance of a spherical capacitor is given by<\/p>\n<p><img decoding=\"async\" style=\"height: 44px; width: 95px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch02\/image383.png\" \/>where <img decoding=\"async\" style=\"height: 25px; width: 13px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch02\/image384.png\" \/>\u00a0and <img decoding=\"async\" style=\"height: 25px; width: 14px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch02\/image385.png\" \/>\u00a0are the radii of outer and inner spheres, respectively.<\/p>\n<p style=\"text-align: justify;\">30: \u00a0A spherical capacitor has an inner sphere of radius 12 cm and an outer sphere of radius 13 cm. The outer sphere is earthed and the inner sphere is given a charge of 2.5 \u00b5C. The space between the concentric spheres is filled with a liquid of dielectric constant 32.<\/p>\n<p>1. Determine the capacitance of the capacitor.<\/p>\n<p>2. What is the potential of the inner sphere?<\/p>\n<p>3. Compare the capacitance of this capacitor with that of an isolated sphere of radius 12 cm. Explain why the latter is much smaller.<\/p>\n<p>31: \u00a0Answer carefully:<\/p>\n<p>1. Two large conducting spheres carrying charges<img decoding=\"async\" style=\"height: 25px; width: 21px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch02\/image406.png\" \/>\u00a0and <img decoding=\"async\" style=\"height: 25px; width: 23px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch02\/image407.png\" \/>\u00a0are brought close to each other. Is the magnitude of electrostatic force between them exactly given by <img decoding=\"async\" style=\"height: 25px; width: 21px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch02\/image406.png\" \/>\u00a0<img decoding=\"async\" style=\"height: 25px; width: 73px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch02\/image408.png\" \/>\u00a0, where r is the distance between their centres?<\/p>\n<p>2. If Columb\u2019s\u00a0 law involved<img decoding=\"async\" style=\"height: 21px; width: 34px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch02\/image409.png\" \/>\u00a0dependence (instead of <img decoding=\"async\" style=\"height: 21px; width: 34px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch02\/image410.png\" \/>), would Gauss\u2019s\u00a0 law be still true?<\/p>\n<p>3. A small test charge is released at rest at a point in an electrostatic field configuration. Will it travel along the field line passing through that point?<\/p>\n<p>4. What is the work done by the field of a nucleus in a complete circular orbit of the electron? What if the orbit is elliptical?<\/p>\n<p>5. We know that electric field is discontinuous across the surface of a charged conductor. Is electric potential also discontinuous there?<\/p>\n<p>6. What meaning would you give to the capacitance of a single conductor?<\/p>\n<p>7. Guess a possible reason why water has a much greater dielectric constant (= 80) than say, mica (= 6).<\/p>\n<p>32: A cylindrical capacitor has two co-axial cylinders of length 15 cm and radii 1.5 cm and1.4 cm. The outer cylinder is earthed and the inner cylinder is given a charge of 3.5<img decoding=\"async\" style=\"height: 21px; width: 25px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch02\/image412.png\" \/>. Determine the capacitance of the system and the potential of the inner cylinder. Neglect end effects (i.e., bending of field lines at the ends).<\/p>\n<p style=\"text-align: justify;\">33: \u00a0A parallel plate capacitor is to be designed with a voltage rating 1 kV, using a material of dielectric constant 3 and dielectric strength about<img decoding=\"async\" style=\"height: 21px; width: 63px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch02\/image419.png\" \/>. (Dielectric strength is the maximum electric field a material can tolerate without breakdown, i.e., without starting to conduct electricity through partial ionisation.) For safety, we should like the field never to exceed, say 10% of the dielectric strength. What minimum area of the plates is required to have a capacitance of 50 pF?<\/p>\n<p>34: \u00a0Describe schematically the equipotential surfaces corresponding to<\/p>\n<p>1. a constant electric field in the z-direction,<\/p>\n<p>2. a field that uniformly increases in magnitude but remains in a constant (say, z) direction,<\/p>\n<p>3. a single positive charge at the origin, and<\/p>\n<p>4. a uniform grid consisting of long equally spaced parallel charged wires in a plane.<\/p>\n<p style=\"text-align: justify;\">35: \u00a0In a Van de Graaff type generator a spherical metal shell is to be a <img decoding=\"async\" style=\"height: 21px; width: 79px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch02\/image432.png\" \/>\u00a0electrode. The dielectric strength of the gas surrounding the electrode is<img decoding=\"async\" style=\"height: 21px; width: 91px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch02\/image433.png\" \/>. What is the minimum radius of the spherical shell required? (You will learn from this exercise why one cannot build an electrostatic generator using a very small shell which requires a small charge to acquire a high potential.)<\/p>\n<p style=\"text-align: justify;\">36: \u00a0A small sphere of radius <img decoding=\"async\" style=\"height: 25px; width: 13px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch02\/image437.png\" \/>\u00a0and charge <img decoding=\"async\" style=\"height: 25px; width: 18px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch02\/image438.png\" \/>\u00a0is enclosed by a spherical shell of radius<img decoding=\"async\" style=\"height: 25px; width: 15px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch02\/image439.png\" \/>\u00a0and charge<img decoding=\"async\" style=\"height: 25px; width: 19px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch02\/image440.png\" \/>. Show that if <img decoding=\"async\" style=\"height: 25px; width: 18px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch02\/image438.png\" \/>\u00a0is positive, charge will necessarily flow from the sphere to the shell (when the two are connected by a wire) no matter what the charge <img decoding=\"async\" style=\"height: 25px; width: 19px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch02\/image440.png\" \/>on the shell is.<\/p>\n<p>37:\u00a0 \u00a0Answer the following:<\/p>\n<p style=\"text-align: justify;\">1. The top of the atmosphere is at about 400 kV with respect to the surface of the earth, corresponding to an electric field that decreases with altitude. Near the surface of the earth, the field is about 100<img decoding=\"async\" style=\"height: 21px; width: 40px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch02\/image441.png\" \/>. Why then do we not get an electric shock as we step out of our house into the open? (Assume the house to be a steel cage so there is no field inside!)<\/p>\n<p style=\"text-align: justify;\">2. A man fixes outside his house one evening a two metre high insulating slab carrying on its top a large aluminium sheet of area<img decoding=\"async\" style=\"height: 20px; width: 32px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch02\/image442.png\" \/>. Will he get an electric shock if he touches the metal sheet next morning?<\/p>\n<p style=\"text-align: justify;\">3. The discharging current in the atmosphere due to the small conductivity of air is known to be 1800 A on an average over the globe. Why then does the atmosphere not discharge itself completely in due course and become electrically neutral? In other words, what keeps the atmosphere charged?<\/p>\n<p style=\"text-align: justify;\">4. What are the forms of energy into which the electrical energy of the atmosphere is dissipated during a lightning? (Hint: The earth has an electric field of about<img decoding=\"async\" style=\"height: 21px; width: 69px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch02\/image443.png\" \/>\u00a0\u00a0at its surface in the downward direction, corresponding to a surface charge density =<img decoding=\"async\" style=\"height: 21px; width: 55px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch02\/image444.png\" \/>\u00a0 <img decoding=\"async\" style=\"height: 21px; width: 27px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch02\/image445.png\" \/>\u00a0. Due to the slight conductivity of the atmosphere up to about 50 km (beyond which it is good conductor), about + 1800 C is pumped every second into the earth as a whole. The earth, however, does not get discharged since thunderstorms and lightning occurring continually all over the globe pump an equal amount of negative charge on the earth.)<\/p>\n<h2><span class=\"ez-toc-section\" id=\"NCERT_Solutions_for_Class_12_Physics\"><\/span><strong>NCERT Solutions for Class 12 Physics<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>NCERT Solutions Class 12 Physics PDF (Download) Free from myCBSEguide app and myCBSEguide website. Ncert solution class 12 physics includes text book solutions from both part 1 and part 2. NCERT Solutions for CBSE Class 12 Physics have total 20 chapters. 12 Physics NCERT Solutions in PDF for free Download on our website. Ncert physics class 12 solutions PDF and physics ncert class 12 PDF solutions with latest modifications and as per the latest CBSE syllabus are only available in myCBSEguide<\/p>\n<p>To download\u00a0NCERT Solutions for class 12 Physics, Chemistry, Biology, History, Political Science, Economics, Geography, Computer Science, Home Science, Accountancy, Business Studies and Home Science; do check myCBSEguide app or website. myCBSEguide provides sample papers with solution, test papers for chapter-wise practice, NCERT solutions, NCERT Exemplar solutions, quick revision notes for ready reference, CBSE guess papers and CBSE important question papers. Sample Paper all are made available through\u00a0<a href=\"https:\/\/play.google.com\/store\/apps\/details?id=in.techchefs.MyCBSEGuide&amp;referrer=utm_source%3Dmycbse_bottom%26utm_medium%3Dtext%26utm_campaign%3Dmycbseads\"><strong>the best app for CBSE students<\/strong><\/a>\u00a0and myCBSEguide website.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>NCERT Solutions class 12 physics Electrostatic Potentia and Capacitance Part 2 Class 12 Physics book solutions are available in PDF format for free download. These ncert book chapter wise questions and answers are very helpful for CBSE board exam. CBSE recommends NCERT books and most of the questions in CBSE exam are asked from NCERT &#8230; <a title=\"NCERT Solutions class 12 physics Electrostatic Potentia and Capacitance Part 2\" class=\"read-more\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-12-physics-electrostatic-potentia-and-capacitance\/\" aria-label=\"More on NCERT Solutions class 12 physics Electrostatic Potentia and Capacitance Part 2\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":-1,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[281,1433],"tags":[283,1342,216,319],"class_list":["post-4420","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ncert-solutions","category-physics-cbse-class-12","tag-cbse-study-material","tag-class-12","tag-ncert-solutions","tag-physics"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>NCERT Solutions class 12 physics Electrostatic Potentia and Capacitance<\/title>\n<meta name=\"description\" content=\"NCERT Solutions class 12 physics Electrostatic Potentia and Capacitance in PDF format for free download. 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