A uniform magnetic field $\mathrm{B}\left(\mathrm{t}\right)$, pointing upward fills a circular region of radius, $\mathrm{s}$ in a horizontal plane. If $\mathrm{B}$ is changes with time, find the induced electric field.
 

What is magnetic dipole moment of a current loop?

A circular coil of $100$ turns with a cross-sectional area (A) of $1 {\mathrm{m}}^2$ is kept with its plane perpendicular to the magnetic field (B) of $1 \mathrm{T}$. What is the magnetic flux linkage with the coil’?

Two inductor coils with inductance $10 \mathrm{mH}$ and $20 \mathrm{mH}$ are connected in series. What is the resultant inductance of the combination of the two coils?