Physics

ICSE Class 12

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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.

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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 m^{2}, 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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