{"id":4418,"date":"2016-05-16T09:49:00","date_gmt":"2016-05-16T04:19:00","guid":{"rendered":"http:\/\/mycbseguide.com\/blog\/ncert-solutions-class-12-physics-electric-charges-and-field-part-2\/"},"modified":"2018-10-22T12:42:54","modified_gmt":"2018-10-22T07:12:54","slug":"ncert-solutions-class-12-physics-electric-charges-and-field-part-2","status":"publish","type":"post","link":"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-12-physics-electric-charges-and-field-part-2\/","title":{"rendered":"NCERT Solutions class 12 physics Electric Charges and Field 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-electric-charges-and-field-part-2\/#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-electric-charges-and-field-part-2\/#CHAPTER_1_ELECTRIC_CHARGES_AND_FIELDS\" >CHAPTER 1 ELECTRIC CHARGES AND FIELDS<\/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-electric-charges-and-field-part-2\/#NCERT_Solutions_class_12_physics_Electric_Charges_and_Field_Part_2\" >NCERT Solutions class 12 physics Electric Charges and Field Part 2<\/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-electric-charges-and-field-part-2\/#NCERT_Solutions_for_Class_12_Physics\" >NCERT Solutions for Class 12 Physics<\/a><\/li><\/ul><\/nav><\/div>\n<p>NCERT Solutions class 12 physics Electric Charges and Field Part 2 Class 12 Physics Class 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><strong>Download\u00a0<a href=\"https:\/\/mycbseguide.com\/downloads\/cbse-class-12-physics\/1251\/ncert-solutions\/5\/\">NCERT solutions for\u00a0Electric Charges and Field Part 2\u00a0\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 Electric Charges and Field Part 2\" width=\"135\" height=\"165\" \/><\/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_1_ELECTRIC_CHARGES_AND_FIELDS\"><\/span>CHAPTER 1 ELECTRIC CHARGES AND FIELDS<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>1.1 Introduction<\/li>\n<li>1.2 Electric Charges<\/li>\n<li>1.3 Conductors and Insulators<\/li>\n<li>1.4 Charging by Induction<\/li>\n<li>1.5 Basic Properties of Electric Charge<\/li>\n<li>1.6 Coulomb\u2019s Law<\/li>\n<li>1.7 Forces between Multiple Charges<\/li>\n<li>1.8 Electric Field<\/li>\n<li>1.9 Electric Field Lines<\/li>\n<li>1.10 Electric Flux<\/li>\n<li>1.11 Electric Dipole<\/li>\n<li>1.12 Dipole in a Uniform External Field<\/li>\n<li>1.13 Continuous Charge Distribution<\/li>\n<li>1.14 Gauss\u2019s Law<\/li>\n<li>1.15 Application of Gauss\u2019s Law<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"NCERT_Solutions_class_12_physics_Electric_Charges_and_Field_Part_2\"><\/span>NCERT Solutions class 12 physics Electric Charges and Field Part 2<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: center;\"><strong>\u00a0<\/strong>18:\u00a0A point charge +10 <img decoding=\"async\" style=\"height: 21px; width: 27px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch01\/image172.png\" \/>\u00a0is a distance 5 cm directly above the centre of a square of side 10 cm, as shown in Fig. 1.34. What is the magnitude of the electric flux through the square? (<em>Hint:<\/em> Think of the square as one face of a cube with edge 10 cm.)<\/p>\n<p>19:\u00a0A point charge of 2.0 <img decoding=\"async\" style=\"height: 21px; width: 27px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch01\/image172.png\" \/>\u00a0is at the centre of a cubic Gaussian surface 9.0 cm on edge. What is the net electric flux through the surface?<\/p>\n<p style=\"text-align: justify;\">20:\u00a0A point charge causes an electric flux of &#8211;<img decoding=\"async\" style=\"height: 21px; width: 122px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch01\/image187.png\" \/>\u00a0 to pass through a spherical Gaussian surface of 10.0 cm radius centered on the charge. (a) If the radius of the Gaussian surface were doubled, how much flux would pass through the surface? (b) What is the value of the point charge?<\/p>\n<p>21:\u00a0A conducting sphere of radius 10 cm has an unknown charge. If the electric field 20 cm from the centre of the sphere is <img decoding=\"async\" style=\"height: 21px; width: 108px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch01\/image194.png\" \/>\u00a0and points radially inward, what is the net charge on the sphere?<\/p>\n<p>22:\u00a0A uniformly charged conducting sphere of 2.4 m diameter has a surface charge density of 80.0 <img decoding=\"async\" style=\"height: 21px; width: 27px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch01\/image201.png\" \/>\u00a0\/m<sup>2<\/sup>. (a) Find the charge on the sphere. (b) What is the total electric flux leaving the surface of the sphere?<\/p>\n<p style=\"text-align: justify;\">23:\u00a0An infinite line charge produces a field of <img decoding=\"async\" style=\"height: 21px; width: 96px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch01\/image215.png\" \/>\u00a0at a distance of 2 cm. Calculate the linear charge density.<\/p>\n<p style=\"text-align: justify;\">24:\u00a0Two large, thin metal plates are parallel and close to each other. On their inner faces, the plates have surface charge densities of opposite signs and of magnitude <img decoding=\"async\" style=\"height: 21px; width: 136px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch01\/image223.png\" \/>\u00a0\u00a0What is E: (a) in the outer region of the first plate, (b) in the outer region of the second plate, and (c) between the plates?<\/p>\n<p>25:\u00a0An oil drop of 12 excess electrons is held stationary under a constant electric field of <img decoding=\"async\" style=\"height: 21px; width: 121px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch01\/image231.png\" \/>\u00a0in Millikan&#8217;s oil drop experiment. The density of the oil is 1.26 g cm<sup>-3<\/sup>. Estimate the radius of the drop. <img decoding=\"async\" style=\"height: 28px; width: 237px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch01\/image232.png\" \/><\/p>\n<p>26:\u00a0Which among the curves shown in Fig. 1.35 cannot possibly represent electrostatic field lines?<\/p>\n<p>(a)<img decoding=\"async\" id=\"Picture 73\" style=\"height: 88px; width: 104px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch01\/image245.jpg\" alt=\"14127835577472.jpg\" \/><\/p>\n<p>(b) <img decoding=\"async\" id=\"Picture 74\" style=\"height: 123px; width: 53px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch01\/image246.jpg\" alt=\"14127835584834.jpg\" \/><\/p>\n<p>(c) <img decoding=\"async\" id=\"Picture 75\" style=\"height: 98px; width: 109px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch01\/image247.jpg\" alt=\"14127835591515.jpg\" \/><\/p>\n<p>(d) <img decoding=\"async\" id=\"Picture 76\" style=\"height: 101px; width: 118px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch01\/image248.jpg\" alt=\"14127835598721.jpg\" \/><\/p>\n<p>(e) <img decoding=\"async\" id=\"Picture 77\" style=\"height: 62px; width: 129px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch01\/image249.jpg\" alt=\"14127835605537.jpg\" \/><\/p>\n<p>27:\u00a0In a certain region of space, electric field is along the z-direction throughout. The magnitude of electric field is, however, not constant but increases uniformly along the positive <em>z<\/em>-direction, at the rate of <img decoding=\"async\" style=\"height: 21px; width: 64px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch01\/image250.png\" \/>\u00a0per metre. What are the force and torque experienced by a system having a total dipole moment equal to <img decoding=\"async\" style=\"height: 21px; width: 32px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch01\/image251.png\" \/>\u00a0Cm in the negative <em>z<\/em>-direction?<\/p>\n<p style=\"text-align: justify;\">28:\u00a0(a) A conductor A with a cavity as shown in Fig. 1.36(a) is given a charge <em>Q<\/em>. Show that the entire charge must appear on the outer surface of the conductor. (b) Another conductor B with charge <em>q<\/em> is inserted into the cavity keeping B insulated from A. Show that the total charge on the outside surface of A is <em>Q<\/em> + <em>q<\/em> [Fig. 1.36(b)]. (c) A sensitive instrument is to be shielded from the strong electrostatic fields in its environment. Suggest a possible way.<\/p>\n<p>29:\u00a0A hollow charged conductor has a tiny hole cut into its surface. Show that the electric field in the hole is <img decoding=\"async\" style=\"height: 52px; width: 49px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch01\/image263.png\" \/><img decoding=\"async\" style=\"height: 28px; width: 13px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch01\/image264.png\" \/>, where <img decoding=\"async\" style=\"height: 28px; width: 13px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch01\/image264.png\" \/>is the unit vector in the outward normal direction, and <img decoding=\"async\" style=\"height: 14px; width: 15px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch01\/image202.png\" \/>\u00a0is the surface charge density near the hole.<\/p>\n<p>30:\u00a0Obtain the formula for the electric field due to a long thin wire of uniform linear charge density <img decoding=\"async\" style=\"height: 19px; width: 14px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch01\/image216.png\" \/>without using Gauss&#8217;s law. [<em>Hint:<\/em> Use Coulomb&#8217;s law directly and evaluate the necessary\u00a0 integral.]\n<p>31:\u00a0It is now believed that protons and neutrons (which constitute nuclei of ordinary matter) are themselves built out of more elementary units called quarks. A proton and a neutron consist of three quarks each. Two types of quarks, the so called &#8216;up&#8217; quark (denoted by u) of charge <img decoding=\"async\" style=\"height: 44px; width: 43px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch01\/image301.png\" \/><em>e<\/em>, and the &#8216;down&#8217; quark (denoted by d) of charge (-1\/3) <em>e<\/em>, together with electrons build up ordinary matter. (Quarks of other types have also been found which give rise to different unusual varieties of matter.) Suggest a possible quark composition of a proton and neutron.<\/p>\n<p>32:\u00a0(a) Consider an arbitrary electrostatic field configuration. A small test charge is placed at a null point (i.e., where E = 0) of the configuration. Show that the equilibrium of the test charge is necessarily unstable.<\/p>\n<p>(b) Verify this result for the simple configuration of two charges of the same magnitude and sign placed a certain distance apart.<\/p>\n<p>33:\u00a0A particle of mass <em>m<\/em> and charge ( &#8211; <em>q<\/em>) enters the region between the two charged plates initially moving along <em>x<\/em>-axis with speed <em>vx<\/em> (like particle 1 in Fig. 1.33). The length of plate is <em>L<\/em> and an uniform electric field <em>E<\/em> is maintained between the plates. Show that the vertical deflection of the particle at the far edge of the plate is <img decoding=\"async\" style=\"height: 25px; width: 104px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch01\/image321.png\" \/><\/p>\n<p><em>Compare this motion with motion of a projectile in gravitational field discussed in Section 4.10 of Class XI Textbook of Physics.<\/em><\/p>\n<p>34:\u00a0Suppose that the particle in Exercise in 1.33 is an electron projected with velocity <img decoding=\"async\" style=\"height: 25px; width: 18px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch01\/image330.png\" \/><img decoding=\"async\" style=\"height: 21px; width: 110px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch01\/image331.png\" \/>\u00a0. If <em>E<\/em> between the plates separated by 0.5 cm is<img decoding=\"async\" style=\"height: 21px; width: 108px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch01\/image332.png\" \/>\u00a0, where will the electron strike the upper plate? (| <em>e<\/em> | =<img decoding=\"async\" style=\"height: 25px; width: 224px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch01\/image333.png\" \/>\u00a0.)<\/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 Electric Charges and Field Part 2 Class 12 Physics Class 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 &#8230; <a title=\"NCERT Solutions class 12 physics Electric Charges and Field Part 2\" class=\"read-more\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-12-physics-electric-charges-and-field-part-2\/\" aria-label=\"More on NCERT Solutions class 12 physics Electric Charges and Field 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-4418","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 Electric Charges and Field Part 2<\/title>\n<meta name=\"description\" content=\"NCERT Solutions class 12 physics Electric Charges and Field Part 2 in PDF format for free download. 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