Briefly explain the change in flux due to rate of change of area?
Magnetic flux
Where,
is the magnetic flux.
is the magnetic field
is the area
the angle at which the field lines pass through the given surface area
Rate of change of magnetic flux due to rate of change of area
According to Faraday’s second law of electromagnetic induction, we know that the induced emf in a coil is equal to the rate of change of flux linkage. Therefore,
where , here is very small area.
So,
The first term is called motional emf because it is connected with area change, i.e., movement of the loop periphery.