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A rod with resistance R lies across frictionless conducting rails in a constant uniform
magnetic field B, pointing out of the paper. Assume the rails have negligible
fig
resistance. The magnitude of the force that mul e applied by a person to pull the
rod to the right at constant speed vis:
BLv
BLv(x/R)
No force (zero Newton)
B²L²V/R
B²L²v(x/R)

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