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Q.

The adjoining figure shows two bulbs B1 and B2 resistor R and an inductor L. When the switch S is turned off,

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a

Both B1 and B2 die out promptly

b

Both B1 and B2 die out with some delay

c

B1 dies out promptly but B2 with some delay

d

B2 dies out promptly but B1 with some delay

answer is C.

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Detailed Solution

Current in B1 will promptly become zero.As the current in B2decreases emf is induced in the inductor and according to Lenz's law , this induced emf tries to increase the current in B2 .As a result  current in B2 will slowly tend to zero.
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