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

The expression for the magnetic energy per unit volume stored in a solenoid in terms of magnetic field is . . . . . . .

If the current of $I$ gives rise to a magnetic flux $\phi$ through a coil having $N$ turns,then the magnetic energy stored in the medium surrounding the coil is

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

If the current through an inductor increases from $2 \ A$ to $3 \ A$,the magnetic energy stored in the inductor increases by: (in $\%$)

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 $H$)?