magnetism Questions

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

The net magnetic flux through any closed surface is:

A very long conducting wire is bent in a semi-circular shape from A to B as shown in the figure. The magnetic field at point P for steady current configuration is:

A wire carrying a current $I$ along the positive $x$ -axis has length $L$. It is kept in a magnetic field $\vec{B}=(2\hat{i}+3\hat{j}-4\hat{k})\text{T}$. The magnitude of the magnetic force acting on the wire is: