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A rod with resistance R lies across frictionless conducting rails in a constant uniform
magnetic field B, pointing into the paper as shown below. Assume the rails have
negligible resistance. The magnitude of the force that must be applied by a person to
pull the rod to the right at constant speed v is:
BLv
B² L²v/ R
No force (zero Newton)
BLv(x/ R)
B?L2v(x/ R)

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