A long straight wire is parallel to one edge and is in the plane of a single-turn rectangular loop as shown. If the loop is changing width so that the distance x changes at a constant rate of 4.0 cm/s, what is the magnitude of the emf induced in the loop at an instant when x = 6.0 cm? Let a = 2.0 cm, b = 1.2 m, and I = 30 A.
A. 5.3 ?V
B. 2.4 ?V
C. 4.8 ?V
D. 2.6 ?V
E. 1.3 ?V
Answer: C
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