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Q.

A resistor with resistance 10MΩ  is connected in series with a capacitor of capacitance 1.0μF and a battery with emf 12V. Before the switch is closed at time t=0, the capacitor is uncharged. 

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The time constant of the circuit (in seconds) is

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answer is 10.

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τ=RC=10×106×106=10  sec

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