First slide

Time -Varying current in L-R circuit

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

Current in B₁ will promptly become zero.As the current in $B_{2}$ decreases emf is induced in the inductor and according to Lenz's law , this induced emf tries to increase the current in $B_{2}$ .As a result current in B₂ will slowly tend to zero.

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