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Q.

A capacitor C=100μF is connected to three resistors each of resistance 1kΩ and a battery of emf 9V. The switch S has been closed for long time so as to charge the capacitor. When switch S is opened, the capacitor discharges with time constant if the capacitor discharges with time constant of z x 10 ms, find the value of z.

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answer is 5.

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Detailed Solution

C=100μF=100×10−6and

 R=12kΩ=0.5×103;

τ=CR=50ms⇒z=5

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