A generator is constructed by rotating a coil of N turnsin a magnetic field B at

Question

A generator is constructed by rotating a coil of N turnsin a magnetic field B at a frequency f. Theinternal resistance of the coil is R and the crosssectional area of the coil is A.
Which of the following statements are true? (Give ALL correctanswers, i.e., B, AC, BCD...)

A) As the coil turns at a steady rate, the maximum induced EMFoccurs when the plane of the coil is perpendicular to the magneticfield direction.
B) The maximum induced EMF occurs when the coil is rotated about anaxis parallel to the magnetic field lines.
C) The average induced EMF doubles if the resistance R isdoubled.
D) The average induced EMF doubles if the magnetic field Bis doubled.
E) The average induced EMF doubles if the area A isdoubled.
F) The average induced EMF doubles if the frequency f isdoubled.

Explanation / Answer

We know the formula for the emf induced in the coil is                    = NBA                      = NBA(2f) Here N is the number of coils, B is the magnetic fieldstrength, A is area of each coil and f is the frequency. The correct statements are (B), (C), (E)

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