A 10 kΩ resistor and a 3 nF capacitor are connected across a 10 V battery. The time it takes for the potential across the capacitor to reach 4 V is (a)   17.5 msecs (b)   15.3 msecs (c)   12.0 msecs (d)   18.0 msecs (e)   2.85 msecs

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