A 4 μF capacitor, a resistance of 2.5 MΩ is in series with 12  V battery. Find the time after whi...

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A 4 μF capacitor, a resistance of 2.5 MΩ is in series with 12  V battery. Find the time after which the potential difference across the capacitor is 3 times the potential difference across the resistor. [Given ln (2)=0.693 ] [IIT-JEE (Screening) 2005]
(a) 13.86  s
(b) 6.93  s
(c) 7  s
(d) 14 s

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