First slide

CIrcuit questions

Question

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

Easy

A

I = 2 mA at all t
B

I oscillates between 1 mA and 2mA
C

I = 1 mA at all t
D

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

Solution

At time t = 0 i.e. when capacitor is charging, current $i = \frac{2}{2000} = 1 mA$
When capacitor is full charged, no current will pass through it, hence current through the circuit $i = \frac{2}{5000} = 0 .4 mA$

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