35.In a model ac generator, a 500-turn rectangular coil, 8.0 cm by 20 cm, rotatesat 120 rev/min in a uniform magnetic field of 0.60 T. (a) What is the maximum emfinduced in the coil? (b) What is the instantaneous value of the emf in the coil att= (π/32) s? Assume that the emf is zero at t=0. (c) What is the smallest value of tfor which the emf will have its maximum value?SolutionWhen a coil rotates in a uniform magnetic field, the emf induced in that coil isgiven by E=()NBAtωωsin. Here, Nis the number of turns on the coil, Bis themagnitude of the magnetic field, Ais the area enclosed by the coil, and ωis theangular frequency of the coil.(a)The angular frequency of the coil is ωππ==120214revminrad1 revmin60 s
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