First slide

Inductance

Question

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

Moderate

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

Solution

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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