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Q.

In the circuit shown below, the key K is closed at t = 0. The current through the battery is :

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a

VR1+R2R1R2 at t=0 and VR2 at t=∞

b

VR1R2R12+R22 at t=0 and VR2 at t=∞

c

VR2 at t=0 and VR1+R2R1R2 at t=∞

d

VR2 at t=0 and VR1R2R12+R22 at t=∞

answer is C.

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Detailed Solution

At t = 0 At t → ∞I=VR2⇒I=VR1+R2R1R2
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In the circuit shown below, the key K is closed at t = 0. The current through the battery is :