A rectangular coil of N turns and of length a and width b is rotated at frequency f in a uniform magnetic field
ℰ =2πf NabB sin(2πft) = ℰ0 sin(2πft).
This is the principle of the commercial alternating-current generator. (b) What value of Nab gives an emf with ℰ0 = 150 V when the loop is rotated at 60.0 rev/s in a uniform magnetic field of 0.500 T?
Figure 30-40 Problem 11.
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