Question

state Faraday's law of electromagnetic induction derive expression for the electromagnetic force induced in a coil rotating uniformly in a uniform magnetic field mention the nature of the EMF​

Answer 1

HEY MATE..!!
ACCORDING TO FARADAY's LAW OF ELECTROMAGNETIC INDUCTION,
1st law- the amount of current passed through an electrode is directly proportional to the amount of material liberated from it.
2nd Law- the magnitude of induced electromagnetic force (emf) is equal to the rate of change of flux linkages with the coil.
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We can deduce the equation for this induced EMF...

Considering a long straight wire cutting a magnetic field perpendicularly to the field lines. The force acing on the wire is given by...

F = B I l

The work done on or by the wire in moving it through the field is given by...

WD = F x, so...

WD = B I l x

In this situation the work is done in moving the wire through the field and is converted in to electrical energy by doing so. Electrical energy is given by emf x charge...

WD = emf x q

and charge is current flowing over a time period..

q = I t, so...

WD = emf x I t

B I l x = emf x I t

emf = B l x / t

Magnetic Flux

From our equation for emf...

E = Blx/ t,

we define the term, f, magnetic flux. This is the magnetic field cut by a wire of length l, moving a distance x, in a magnetic field B.
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