question_answer

A resistance R and a capacitance C are connected in series to a battery of negligible internal resistance through a key. The key is closed at t = If after t sec the voltage across the capacitance was seven times the voltage across R, the value of t is   JEE Main Online Paper (Held On 12 May 2012)

A) \[3RC\ell n2\]                   

B)                        \[2RC\,\ell n2\]

C)                        \[2RC\,\ell n7\]                

D)                        \[3RC\,\ell n7\]