An inductor of inductance L =400 mH and resistors of resistances $R_1 = 2 \Omega$ and $R_2 = 2 \Omega$ are connected to a battery of emf 12V as shown in the figure. The internal resistance of the battery is negligible. The switch S is closed at t = 0. The potential drop across L as a function of time is <br>

Question

( A ) $\frac{12}{t} e^{-3t}V$
( B ) $12 e^{-5t}V$
( C ) $6 e^{-5t}V$
( D ) $6 (1- e^{-t/0.2})V$