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.
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.)
Resistivity does not depend on the dimensions of wire so it will remain the same.
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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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10.What type of wavefront is generated from a line source of light ?
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