Question

when is speed of rotation of the coil is doubled what will happen to the amplitude​

Answer 1

Explanation:

The frequency increases (there are more waves in the

same time) because the generator completes

more rotations in the same time. One complete turn

of the generator produces one complete wave.

The amplitude increases (the waves go further up and down

from the zero line) showing that a

higher voltage is induced in the coil around the armature.

This happens because the coil is moving

through the field from the permanent magnet more quickly.