A Rod of Length L and Electrical Resistance R Moves

question 88

Multiple Choice

A rod of length L and electrical resistance R moves through a constant uniform magnetic field ; both the magnetic field and the direction of motion are parallel 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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