A $4.0 - \mathrm { mH }$ Coil Carries a Current Of

Multiple Choice

A $4.0 - \mathrm { mH }$ coil carries a current of $5.0 \mathrm {~A}$ . How much energy is stored in its magnetic field?

A) $20 \mathrm {~mJ}$
B) $2.0 \mathrm {~mJ}$
C) $10 \mathrm {~mJ}$
D) none of the given answers