Answer: 10. [2pt] A generator is constructed by rotating a coil of N turns in a

Question

Answer:  

10. [2pt]
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 area A is doubled.
C) The maximum induced EMF occurs when the coil is rotated about an axis parallel to the magnetic field lines.
D) The maximum induced EMF occurs when the coil is rotated about the axis of the coil.
E) The average induced EMF doubles if the magnetic field B is doubled.
F) The average induced EMF doubles if the resistance R is doubled.

Answer:

Explanation / Answer

9) A) fig2: Loop moving South, no induced current.
B) fig2: Loop moving East, induced current `b'.
C) fig1: Magnet moving West, induced current `a'.
D) fig1: Loop moving West, induced current `a'.
E) fig1: Magnet moving East, induced current `a'.
F) fig2: Loop moving North, induced current `b'.

The statement is true. A,B,D,E

10) A) The average induced EMF doubles if the frequency f is doubled.
B) The average induced EMF doubles if the area A is doubled.
C) The maximum induced EMF occurs when the coil is rotated about an axis parallel to the magnetic field lines.
D) The maximum induced EMF occurs when the coil is rotated about the axis of the coil.
E) The average induced EMF doubles if the magnetic field B is doubled.
F) The average induced EMF doubles if the resistance R is doubled.

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