A generator is constructed by rotating a coil of N turns in a magnetic field B a

Question

A generator is constructed by rotating a coil of N turns in a magnetic field B at a frequency f. The internal resistance of the coil is R and the cross sectional area of the coil is A. Which of the following statements are true? (Give ALL correct answers, i.e., B, AC, BCD...) A) The average induced EMF doubles if the frequency f is doubled. B) The average induced EMF doubles if the magnetic field B is doubled. C) The maximum induced EMF occurs when the coil is rotated about an axis parallel to the magnetic field lines. D) The average induced EMF doubles if the resistance R is doubled. E) The average induced EMF doubles if the area A is doubled. F) The maximum induced EMF occurs when the coil is rotated about the axis of the coil.

Explanation / Answer

A. false-emf is proportional to f

B. true-emf is porportional to b

C. true-max emf when plane of coil pararell to b (max "cutting"flux)

D. false-induced emf hasnothing to do with r

E. true-emf is porportional to a

F.true

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