An inductor may store energy in

$A$ coil of self-inductance $0.5 \ mH$ carries a current of $2 \ A$. The energy stored in Joule is . . . . . . .

$A$ $100\, mH$ coil carries a current of $1\, A$. The energy stored in its magnetic field is......$J$.

The energy stored in an inductor of self-inductance $L$ henry carrying a current of $I$ ampere is:

$A$ coil of resistance $10 \, \Omega$ and an inductance $5 \, H$ is connected to a $100 \, V$ battery. The energy stored in the coil is:

When a current $I$ flows through a coil,it stores the energy $E_1$ in it. Now the current is reduced to $I/2$,the energy stored in the coil becomes $E_2$. The change in the energy is