The magnetic potential energy stored in a certain inductor is $25 \ mJ$,when the current in the inductor is $50 \ mA$. What is the inductance (in $H$)?

In what form is the energy stored in an inductor?

The magnetic energy stored in an inductor of inductance $4\,\mu H$ carrying a current of $2\,A$ is:

$(a)$ 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?

If a current flowing in a coil is reduced to half of its initial value,the relation between the new energy $(E_2)$ and the original energy $(E_1)$ stored in the coil will be

$A$ current $2 \ A$ flows through a solenoid of self-inductance $3 \ mH$. The energy stored inside the solenoid is $.... \ mJ$.