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 µiT directed 30° below the horizontal. What is the magnitude of the potential difference between the ends of the wire? O a 31 V O b. 36 uV 21 AV d. 18 V 24 uV
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