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Q.

In the following circuit, the bulb will become suddenly bright if

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a

Contact is made or broken

b

Contact is made

c

Contact is broken

d

Won't become bright at all

answer is C.

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Detailed Solution

When contact is broken, current in the circuit decreases. To oppose, the inductor releases current and emf is induced. This induced emf is having high value. Therefore, the bulb will become suddenly bright.
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