A simple electric generator (as shown) is rotating about the y-axis with a frequ
ID: 2255184 • Letter: A
Question
A simple electric generator (as shown) is rotating about the y-axis with a frequency f. There is a uniform magnetic field B = 0.5 Tesla in the +z-direction. The rotor consists of a coil of n windings each with an area, S. The generator, through slipping contacts is powering a light bulb whose resistance is R. The resistance of the coil is negligibly small compared to that of the light bulb.
a) What is the maximum value of the induced alternating current?
b) What is the time-averaged mechanical power that must be supplied to maintain the rotation (neglecting mechanical friction)?
A simple electric generator (as shown) is rotating about the y-axis with a frequency f. There is a uniform magnetic field B = 0.5 Tesla in the +z-direction. The rotor consists of a coil of n windings each with an area, S. The generator, through slipping contacts is powering a light bulb whose resistance is R. The resistance of the coil is negligibly small compared to that of the light bulb. What is the maximum value of the induced alternating current? What is the time-averaged mechanical power that must be supplied to maintain the rotation (neglecting mechanical friction)?Explanation / Answer
a) Imax=BS*(2pi*f)/R
b)0.5 B^2*S^2*(2*pi*f)^2*R=Power
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