Question

What is the basic cause of induced E.M.F​

Answer 1

Answer:

For a stationary conductor the EMF is caused entirely by electric fields. What happens is there are always electric fields when magnetic fields change. The induced electric fields and the changing magnetic fields have a common cause.

For a moving conductor in an unchanging magnetic field, the EMF is caused by the magnetic field exerting a force on moving charges.

For a moving conductor in a changing magnetic field, the EMF is caused by both electric and magnetic forces.

For your examples you need to look at whether things are moving and whether fields are changing. And whatever causes those things are ultimately responsible.

Explanation:

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Answer 2

Answer:

The cause of induced E.M.F. is change in the magnetic flux.

Explanation:

Induced EMF (induced electromotive force) or electromagnetic induction is the formation of a potential difference in a coil due to the change in the magnetic flux through the coil.

Electromotive Force or EMF is induced when the flux linking with a coil changes.

We can write it an expression as:

$E.M.F.=-\frac{\partial \phi}{\partial t} =-\frac{\partial B.A}{\partial t}$

Where φ is the magnetic flux of coil.

Where A is the area vector perpendicular the coil, B is the magnetic field and t is time.

• The electric conductor or coil is placed in the presence of a changing magnetic field cause the induced E.M.F.
• A current carrying coil that is moving constantly is placed in a stable and static magnetic field which will change in the area vector and EMF will be generated.

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