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# CLASS XII – SAMPLE PAPER

## PHYSICS

Time allowed : 3 hours

Max. Marks : 70

General Instructions:

1. All questions are compulsory
2. There are 30 questions in total. Questions 1 to 8 carry one mark each, 9 to 18 carry two marks each, 19 to 27 carry 3 marks each and 28 to 30 carry 5 marks each.
3. There is no overall choice, but internal choices are provided. You have to attempt only one choice in full.
4. Use of calculator is not permitted.
5. You may use the logarithm table, if required.

1. Express dielectric constant in terms of capacitance.

2. What is magnetic susceptibility?

3. Define electromagnetic induction. (more…)

## What is Eddy Current?

Eddy currents are circulating currents induced in the body of a solid conductor whenever the magnetic flux linked with it changes. It is called EDDY CURRENT because they are like eddies formed in water.

## Electric Current and flow of electrons

I have read that the FLOW OF ELECTRONS is called electricity. I wanna know that what is meant by flow of electrons? Pleaz answer me….

Electric current is the flow of charges. (Measured as the rate of flow of charges).

In conductors electric current is caused by the flow of free electrons. When a potential difference is applied across a conductor, the electrons are accelerated towards the positive potential. (But, due to the presence of plenty of electrons, they cannot move with acceleration as they collide with each other during their motion.) There is a net drift of electrons across any cross section and a current is developed.

## Why direct currents aren’t used in Home circuits?

How can an alternating current change its direction while moving in a wire or any conductor? Why direct currents aren’t used in Home circuits?
Alternating current is produced by rotating a coil in a strong magnetic field (or by rotating magnet around the coil)
So, during every half rotation the direction of emf (voltage) induced in the […]

## Eddy currents and applications

What ere Eddy currents and what is their application?
Eddy currents (also called Foucault currents) are currents induced in conductors, when the magnetic flux linked with a solid conductor changes. The change in magnetic flux can cause a circulating flow of electrons, or a current, within the body of the conductor.
The term eddy current comes […]

## Direction of magnetic field due to a current carrying conductor

“How do we know the direction of magnetic field around the current carrying conductor?” Asked Nikhil

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## Coulombian force and conductor

what’s effect of  coulombic forces on conductor medium ?

amk niazi

Ans:

In a conductor, the coulombian  repulsive forces  pushes the valence electrons and the electrons move away from the center to the surface ie from the region of stronger force to the region of lesser force, creating a Faraday cage

#### Incoming search terms:

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