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Questions  

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

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

detailed solution

Correct option is C

Emf is induced in inductor, which opposes the decrease in current due to Lenz's law, therefore current does not become zero rapidly and bulb B2​ dies out with some delay. On the other hand bulb B1​ and resistance R, constitute a simple R circuit , in which as the voltage becomes zero, current becomes zero and B1​ dies out promptly.

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