Faraday\'s law states that an induced emf is proportional to (Please explain you

Question

Faraday's law states that an induced emf is proportional to

(Please explain your answer.)

(A) the rate of change of the magnetic field

(B) the rate of change of the electric field

(C) the rate of change of the magnetic flux

(D) the rate of change of the electric flux

(E) none of above


A circular loop of wire rotates about the diameter in a magnetic field that is perpendicular to the axis of rotation. Looking in the direction of the field at the loop the induced current is:

(Please explain your answer)

(A) always clockwise

(B) always counter clockwise

(C) clockwise in the lower half of the loop and counterclockwise in the upper half

(D) clockwise in the upper half of the loop and counterclockwise in the lower half

(E) sometimes clockwise and sometimes counterclockwise



An important application of induction is to generate electricity. Describe the working princple of a windmill. That is, how to transform mechanical energy into electric energy? How you will use Faraday's law and Lenz's law in the windmill driven electric generator?

Explanation / Answer

Concept:    Farady's law for electroamgnetic induction    states that , The induced emf in the closed loop    is propotional to Rate of change of magneticflux Mathematically ,     If e is the emf induced , dB/dt is the change of     Magnetic flux    thus, e = - dB / dt    hence , among the given option: (C)    hence , among the given option: (C)

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