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A rectangular conducting loop has one side that can slide on frictionless conducting rails
(picutred). A resistor R = 1.2N forms one side of the loop, and represents all the resistance in the
loop. The two rails are L = 10 cm apart. If a force F = 5N is required to move the sliding rail at a
constant velocity of v = 2m/s, what is the magnitude of the uniform magnetic field in the region?
(a) 8.48 T
(b) 12.5 T
(c) 17.3 T
(d) 21.9 T

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