The magnetic flux linked with a coil (in $\mathrm{Wb}$) is given by the equation : $\varphi =5t^2+3t+16$. The increase in the induced emf in the coil in the fourth second will be

A rectangular conducting loop moves horizontally in a uniform magnetic field $\overrightarrow{\mathrm{B}}$ perpendicular to its plane.

Will there be any induced current in the loop or any work required to move the loop, if the loop is completely in the field?

A rectangular conducting loop moves horizontally in a uniform magnetic field $\overrightarrow{\mathrm{B}}$ perpendicular to its plane.

If the loop is partially out of the field, then?

A rectangular conducting loop moves horizontally in a uniform magnetic field $\overrightarrow{\mathrm{B}}$ perpendicular to its plane.

What if the loop is stationary and the field changes with time?