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Plz search to aman dhattarwal important questions for physics on YouTube they are the best Aman bhaiya has given the link of imp. Ques. In description box just do them they are enough i have done the same

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The capacitance of a parallel plate capacitor with air as medium is 3 uF With the introduction of s dielectric medium between the plates, the capacitance hecomes 15 uF The permitivity of the medism is

Posted by Dharmesh Dev 7 years ago

CBSE > Class 12 > Physics

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When an unpolarised light passes through a polalyser then a polarised light comes out... How it happens.??

Posted by Amandeep Kumar 7 years ago

CBSE > Class 12 > Physics

4 answers

Drake Verma 7 years ago

Thanx Mohit bro... helping other feels good

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Mohit Sepat 7 years ago

Wow ,,how much large description u have wrote ????

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Drake Verma 7 years ago

What is unpolarized light-a light which travels in random directions in electric and magnetic waves...but the question is how it's get polarised...so your answer will vary according to the polarizer beacuse each polarizer polarize the lights in different way and there r 3 ways-One way to polarize light is by reflection. Light reflecting off a surface will tend to be polarized, with the direction of polarization (the way the electric field vectors point) being parallel to the plane of the interface. Another way to polarize light is by selectively absorbing light with electric field vectors pointing in a particular direction. Certain materials, known as dichroic materials, do this, absorbing light polarized one way but not absorbing light polarized perpendicular to that direction. If the material is thick enough to absorb all the light polarized in one direction, the light emerging from the material will be linearly polarized. Polarizers (such as the lenses of polarizing sunglasses) are made from this kind of material. A third way to polarize light is by scattering. Light scattering off atoms and molecules in the atmosphere is unpolarized if the light keeps traveling in the same direction, is linearly polarized if at scatters in a direction perpendicular to the way it was traveling, and somewhere between linearly polarized and unpolarized if it scatters of at another angle. There can be more ways but these r main ways... Hope you understands that Any related queries pls ask Thank u(#Alternate)

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Harshit Gupta 7 years ago

It is due to use of palaroid. A Polaroid consists of micro crystals of herapathite (an iodosulphate of quinine). Each crystal is a doubly refracting medium, which absorbs the ordinary ray and transmits only the extra ordinary ray. Thus, allowing only one dimensional light.i.e plane polarised light

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what us maxwell ampere circuital law?

Posted by Sonu Raza 7 years ago

CBSE > Class 12 > Physics

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Nikhil Sirohi 7 years ago

Line integral of a conductor is equal to the u0 times the current passing through the conductor

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Is electricity an electromagnetic wave

Posted by Aalekh Prasad 7 years ago

CBSE > Class 12 > Physics

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How to study physics for those whose are badly weak in physics??

Posted by Vaidansh Saini 5 years, 8 months ago

CBSE > Class 12 > Physics

2 answers

Shreya Bhardwaaj 7 years ago

Chapters which are easy study that and which are scoring

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Drake Verma 7 years ago

Just get stuck to the main topics... don't waste time in completing the whole syllabus... main topics will let you get sufficient marks

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A p type conductor has acceptor level 57meV above the valence band. What is the maximum wavelength of light required to create a hole

Posted by Charu Gupta 7 years ago

CBSE > Class 12 > Physics

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How many internal choice in board exam

Posted by Vinay Yadav 7 years ago

CBSE > Class 12 > Physics

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Drake Verma 7 years ago

11 questions will be in upcoming exams...33percent increase is there in the internal questions

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The no. of images formed due to multiple reflection is always odd,why??

Posted by Utkarsh Chauhan 7 years ago

CBSE > Class 12 > Physics

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What is the electric field at the axial Line of a dipole

Posted by Jayesh Rai 7 years ago

CBSE > Class 12 > Physics

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Name the current which can flow in the absence of electric charge

Posted by Nitesh Chhikara 7 years ago

CBSE > Class 12 > Physics

1 answers

Prateek Khutela 7 years ago

Displacement current

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In diffraction of a light at a single slit The formula for nth secondary minimum is sin(theta) = n×lemda/a Since lemda≥a So lemda/a≥1 Also n>1 → sin theta>1 Am I right?

Posted by Manmeet Marwaha 7 years ago

CBSE > Class 12 > Physics

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A slab of same area as that of parallel plate capacitor i. But of thickness 3/4th of distance betwwen them . What is capacitance

Posted by Sohail Khan 7 years ago

CBSE > Class 12 > Physics

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Two current carrying wire 1 and 2 are three find the magnitude and magnetic field at a point P,Q,R

Posted by Tarun Namdev 7 years ago

CBSE > Class 12 > Physics

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Discuss intensity of transmitted light when a polaroid sheet is rotated between two crossed polaroids.

Posted by Rahul Dahiya 7 years ago

CBSE > Class 12 > Physics

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1. Define atomic mass unil W'rir te its energy equivalent in MeV. 2. What was the drawback of Rutherford model of atom?

Posted by Rohith Trohith 7 years ago

CBSE > Class 12 > Physics

1 answers

Mohit Sepat 7 years ago

Cannot explain stability and does not tell about line sppectra of elements

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What is electric polarization?

Posted by Vivek Thapliyal 7 years ago

CBSE > Class 12 > Physics

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Yogita Ingle 7 years ago

Electric polarization, slight relative shift of positive and negative electric charge in opposite directions within an insulator, or dielectric, induced by an external electric field. Polarization occurs when an electric field distorts the negative cloud of electrons around positive atomic nuclei in a direction opposite the field. This slight separation of charge makes one side of the atom somewhat positive and the opposite side somewhat negative. In some materials whose molecules are permanently polarized by chemical forces, such as water molecules, some of the polarization is caused by molecules rotating into the same alignment under the influence of the electric field. One of the measures of polarization is electric dipole moment, which equals the distance between the slightly shifted centres of positive and negative charge multiplied by the amount of one of the charges. Polarization P in its quantitative meaning is the amount of dipole moment p per unit volume V of a polarized material, P = p/V.

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Two wires A and B of the same material and having same length, have their cross sectional areas in the ratio 1:6. Find the ratio of heat produced in these wires when same voltage is applied across each?

Posted by Sourav Thanoch 7 years ago

CBSE > Class 12 > Physics