Question: A motor with a brush-and-commutators arrangement, as described in Example 29.5 has a circular coil with radius 2.5 cm and 150 turns of wire. The

A motor with a brush-and-commutators arrangement, as described in Example 29.5 has a circular coil with radius 2.5 cm and 150 turns of wire. The magnetic field has magnitude 0.060 T, and the coil rotates at 440rev/min
(a) What is the maximum emf induced in the coil?
(b) What is the average back emf?

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