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.

T/F

1. The maximum induced EMF occurs when the coil is rotated about an axis perpendicular to area A.

2.  The average induced EMF doubles if the resistance R is doubled.

3. The average induced EMF doubles if the area A is doubled.

4. The average induced EMF doubles if the magnetic field B is doubled.

5. The average induced EMF doubles if the frequency f is doubled.

Explanation / Answer

A) True - emf is proportional to B
B) False - max emf when plane of coil is parallel to B (max "cutting" of flux)
C) False - emf is proportional to f
D) True - emf is proportional to A
E) False - induced emf has nothing to do with R

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