A 12-V Battery Is Connected in Series with a Switch $\Omega$

A 12-V battery is connected in series with a switch, 6.0- $\Omega$ resistor, and coil. What energy is stored in the coil when the current is 2.0 A? The time constant is 2.0 *10^-3 s.

A) 9.6 *10^-3 J
B) 4.8 *10^-3 J
C) 2.9 *10^-2 J
D) 2.4 *10^-2 J