A 20-cm length of wire is held along an east-west direction and moved horizontally to the north with a speed of 3.0 m/s in a region where the magnetic field of the earth is 60 ?T directed 30° below the horizontal. What is the magnitude of the potential difference between the ends of the wire?
A. 36 ?V
B. 18 ?V
C. 31 ?V
D. 24 ?V
E. 21 ?V
Answer: B
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