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...) NOTE!!! Some of these statements have been changed from your printed copy in order to make the statements more clear. The rms average induced EMF doubles if the frequency/is doubled. The rms average induced EMF doubles if the resistance R is doubled. The rms average induced EMF doubles if the area A is doubled. The maximum induced EMF occurs when the coil is rotated about an axis parallel to the magnetic field lines. The maximum induced EMF occurs when the coil is rotated about the axis of the coil regardless of the direction of the magnetic field. The rms average induced EMF doubles if the magnetic field B is doubled. Answer: The figures below show two different situations where a current may be induced in a loop according to Faraday's Law, with the direction given by Lenz' Law. The magnetic field is shown by the x's in Fig. 2. Select ALL correct answers (i.e. B, AC, BCD) for the current in the loop. (The compass directions are defined in the usual way.) fig2: Loop moving South, no induced current. Fig1: Loop moving West, induced current 'a'. fig2: Loop moving East, induced current 'b'. fig2: Loop moving North, induced current 'b'. fig1: Magnet moving West, induced current 'a'. fig1: Magnet moving East, induced current 'a'. Answer:

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8)

ACF

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