Question

How is an emf induced by changing magnetic flux?

Answer 1

As the electrons get accumulated, a potential will be developed and hence an EMF,

Since, as the magnetic field is changing then, EMF will also change.

Explanation:

The electrons, `e^-`, in a conductor remains always in random motion; with average velocity `v`.

If it is kept under changing Magnetic Field, B, will exert a force

`F = q. v. B. Sin Ø`

Ø: is angle between the velocity and magnetic field.

Thus electron(s) will move toward a particular direction decided by the vectorial product of

`Velocity` x `"Magnetic Field"`.

As the electrons get accumulated, a potential will be developed and hence an EMF,

Since, the magnetic field is changing then, EMF will also change.

`=>`This is probably the reason, changing EMF is developed by changing magnetic field or flux.