Question

How does rotating a coil faster increase voltage in a dynamo?

Answer 1

it induces an emf in the coil , the faster you do it the more will be the voltage induced , you can check it with the help of a galvanometer

Answer 2

The ways to increase the voltage are as follows :

⇒ By increasing the speed of rotation .

⇒ By increasing the area of coil .

⇒ By increasing the strength of magnetic field.

⇒ By increasing the number of turns of coil.

⇒ By inserting a soft iron.

All above processes would increase speed of rotation and make the coil rotate faster.