A rod of length L and electrical resistance R moves through a constant uniform magnetic field perpendicular to the rod. The force that must be applied by a person to keep the rod moving with constant velocity is:

Question

A rod of length L and electrical resistance R moves through a constant uniform magnetic field  perpendicular to the rod. The force that must be applied by a person to keep the rod moving with constant velocity  is:

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The Answer of A rod of length L and electrical resistance R moves through a constant uniform magnetic field  perpendicular to the rod. The force that must be applied by a person to keep the rod moving with constant velocity  is:

A Rod of Length L and Electrical Resistance R Moves