When the key K is pressed at time t=0 , which of the following statements about the current I in the resistor AB of the given circuit is true

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I = 2 mA at all t

I oscillates between 1 mA and 2mA

I = 1 mA at all t

At t = 0 , I = 1 mA and with time it goes to 0.4 mA

answer is D.

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Detailed Solution

At time t = 0 i.e. when capacitor is charging, current i=22000=1mAWhen capacitor is full charged, no current will pass through it, hence current through the circuit i=25000=0.4mA

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