The following diagram in Figure shows a fixed coil of several turns connected to a centre zero galvanometer $G$ and a magnet $NS$ which can move in the direction shown in the diagram.

Describe the observation in the galvanometer if the magnet is kept still after it has moved into the coil.

The following diagram in Figure shows a fixed coil of several turns connected to a centre zero galvanometer $G$ and a magnet $NS$ which can move in the direction shown in the diagram.

Describe the observation in the galvanometer if the magnet is then rapidly pulled out of the coil.

The following diagram in Figure shows a fixed coil of several turns connected to a centre zero galvanometer $G$ and a magnet $NS$ which can move in the direction shown in the diagram.

How would the observation in part (a) alter if a more powerful magnet is used?

The following diagram in Figure shows a coil $X$ connected to a sensitive centre-zero galvanometer $G$ and a coil $P$ connected to a battery through a switch $S.$

Describe the observation when the switch $S$ is (i) closed suddenly, (ii) then kept closed, (iii) finally opened.

The following diagram in Figure shows a coil $X$ connected to a sensitive centre-zero galvanometer $G$ and a coil $P$ connected to a battery through a switch $S.$

Name and state the law which explains the above observations.

In an a.c. generator the speed at which the coil rotates is doubled. How would this affect

(a) the frequency of output voltage

(b) the maximum output voltage.