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A Rod with Resistance R Lies Across Frictionless Conducting Rails

question 54

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A rod with resistance R lies across frictionless conducting rails in a constant uniform magnetic field B, as shown. 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: A rod with resistance R lies across frictionless conducting rails in a constant uniform magnetic field B, as shown. 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:   A)  0 B)  BLv C)  BLv/R D)  B<sup>2</sup>L<sup>2</sup>v/R E)  B<sup>2</sup>Lxv/R

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