What is the magnitude of the induced current in the circular loop $KLMN$, of radius '$r$' if the straight wire $PQ$ carries a steady current of magnitude '$i$' ampere?

 

Fig. shows two positions of a loop $PQR$ in a perpendicular uniform magnetic field. In which position of the coil is there an induced emf?

In the given figure, $A$ and $B$ are identical magnets. Magnet $A$ is moved away from the coil with a given speed. Magnet $B$ is moved towards the coil with the same speed. What is the induced emf in the coil?

A bar magnet is moved in the direction indicated by an arrow between two coils $AB$ and $CD$ as shown in the figure. Indicate the direction of the induced current in each coil.

Twelve wires of equal lengths are connected in the form of a skeleton-cube which is moving with a velocity $\overrightarrow{v}$ in the direction of a magnetic field $\overrightarrow{B}$. Find the emf in each arm of the cube.