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 frequency f is doubled.

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

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

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

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

Explanation / Answer

inducded emf e = NABW

where   = w = 2pi f

so

1. if f doubles, emf also doublkes ------True

2. False

3. if B doubles, emf also dbles, -----True

4. emf = i/R if R doubles, Emf reduces, so flase

5. true

so the combination is TFTFT

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