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Question

(a) What do you understand by the term "electromagnetic induction"? Explain with the help of a diagram.
(b) Name one device which works on the phenomenon of electromagnetic induction.
(c) Describe different ways to induce current in a coil of wire.

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Solution

(a) In case of relative motion between a source of magnetic field and conductor, current flows inside the conductor. This phenomenon is called electromagnetic induction. For example, when a bar magnet is moved towards a coil of wire attached to a galvanometer, a deflection in galvanometer needle is observed due to induced current as shown in the figure.


(b) An electric generator works on the principle of electromagnetic induction.

(c) Different ways of inducing current in a wire:
  1. When a magnet is moved towards/away from the coil of wire connected to a galvanometer, a deflection in the galvanometer is observed due to induced current, change in magnetic field and relative motion between magnet and coil. (fig. 1)
  1. Take a coil of wire and connect it to a power supply. Now, place another coil connected to a galvanometer near the first coil and switch on the power supply connected to the first coil. A deflection in the galvanometer is observed due to induced current and change in magnetic field generated by the first coil. (fig 2)

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