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.

True or False

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

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

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

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

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

Explanation / Answer

1) no
2) true .. E(rms) proportional to E(peak)
3) no .. not if field is parallel to rotation axis
4) true
5) uncertain .. if doubling R is due to doubling N, then true .. otherwise , no (E not dependent on R)

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