a) Switch in the primary is kept in the ON position. Will the bulb in the secondary glow? Justify your answer.
b) When the current in the primary is switched OFF. What happens to the magnetic field in the secondary coil? How will this change influence the current in the secondary and the glow in the electric bulb?

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Solution

a) If the primary circuit is kept ON, there is no change in magnetic flux. Hence, no induced emf and so the bulb in the secondary does not glow.
b) At the time of turning the switch OFF, there is a sudden change in magnetic flux which causes an induced emf. Hence, the bulb in the secondary glows momentarily.

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