The energy stored in a coil of inductance $L$ carrying a steady current $i$ is in the form:

$A$ $100 mH$ coil carries a current of $1 A$. Energy stored in the form of magnetic field is (in $J$)

If the current in an $LR$ circuit is reduced to half,what will be the energy stored in it?

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 $H$)?

$(a)$ 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?

The expression for the magnetic energy stored in a solenoid of length $L$,in terms of magnetic field $B$ and area $A$ is