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ISC Class 12 Physics Solved Question Paper 2008

Short Answer Type

Write Coulomb’s Law in vector form.

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2. How much kinetic energy is gained by an electron, initially at rest, when it moves through a potential difference of 1000 V ? Leave your answer in Joule.

Given,

V = 1000 V

K.E. = eV

= 1.6 x 10^-19 x 1000

K.E. = 1.6 x 10^-16 J, kinetic energy

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3. A wire of resistivity y is stretched uniformly so that its length becomes four times. What is its new resistivity ? (Assume temperature of the wire remains constant during stretching of the wire.)

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4. Show graphically how electrical resistance of a piece of Silicon or Germanium varies when its temperature is varied.

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5. A circular coil having 50 turns, each with an area of 0.01 m², carries a current of 2A. Calculate its magnetic dipole moment.

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6. How are the electric vector E , the magnetic vector B and velocity vector c oriented in an electromagnetic wave?

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7. State two conditions which must be satisfied in order to apply Tangent Law in magnetism?

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8. A straight conductor of length 0.4 m is moved with a speed of 7 ms^-1 along the direction of a uniform magnetic field. What will be the emf induced, if any, across its ends ?

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9. An alternating current of frequency f is flowing through an ideal choke coil of self inductance L. If V° and I ° be the peak values of the voltage and current, find the average power consumed, if any, by the choke coil.

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