A Rod of Length L and Electrical Resistance R Moves

question 69

Multiple Choice

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) 0
• B) BLv
• C) BLv/R
• D) B²L²v/R
• E) B²L²v²/R

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