Q4 of 26 Page 1

Give one example of use of eddy currents.

The Example of use of eddy current is induction motor. In induction motor eddy current is used in a rotor for its rotation. The metallic cylinder produces eddy current in rotating magnetic field.


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2

Depict the behaviour of magnetic field lines in the presence of a diamagnetic material.

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The charging current for a capacitor is 0.25 A. What is the displacement current across its plates?

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Define Electric Flux. Write its SI unit.

 6

(i) State Bohr postulate of hydrogen atom that gives the relationship for the frequency of emitted photon in a transition.

(ii) An electron jumps from fourth to first orbit in an atom. How many maximum number of spectral lines can be emitted by the atom? To which series these lines correspond?


OR


Use de-Broglie’s hypothesis to write the relation for the nth radius of Bohr orbit in terms of Bohr’s quantization condition of orbital angular momentum.