The energy stored in a $50 \, mH$ inductor carrying a current of $4 \, A$ will be $J$.

The magnetic potential energy stored in a certain inductor is $64 \times 10^{-3} \ J$,when the current in the inductor is $80 \ mA$. The inductance of this inductor is: (in $H$)

The magnetic energy stored in an inductor of inductance $4 \ H$ carrying a current of $1.5 \ A$ is

Average energy stored in a pure inductance $L$ when a current $i$ flows through it,is

Energy stored in a coil of self-inductance $40 \, mH$ carrying a steady current of $2 \, A$ is.....$J$

$(a)$ Obtain the expression for the magnetic energy stored in a solenoid in terms of magnetic field $B$,area $A$,and length $l$ of the solenoid.
$(b)$ How does this magnetic energy compare with the electrostatic energy stored in a capacitor?