Question

How is magnetic flux linked with the armature coil changed in generator?

Answer 1

it changes due to rotation of armature

we have formula

∅(magnetic flux)=BAcosФ

B and A remains same

cosФ changes as angle changes due to rotation hence flux linked with armature coil changes

Answer 2

Faraday's Principle of Electromagnetic Induction states that the emf induced in a loop due by a changing magnetic flux is equal to the rate of change of the magnetic flux threading the loop. The magnetic flux threading a coil of wire can be changed by moving a bar magnet in and out of the coil.