A 0.300 kg metal rod carrying a current of 34.0 A glides on two horizontal rails 0.500 m apart. What vertical magnetic field is required to keep the rod moving at a constant speed if the coefficient of kinetic friction between the rod and rails is 0.100?

Physics for Scientists and Engineers with Modern Physics
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ISBN:9781337553292
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter28: Magnetic Fields
Section: Chapter Questions
Problem 23P: Review. A rod of mass 0.720 kg and radius 6.00 cm rests on two parallel rails (Fig. P28.23) that are...
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A 0.300 kg metal rod carrying a current of 34.0 A glides on two horizontal rails 0.500 m apart. What vertical magnetic field is required to keep the rod moving at a constant speed if the coefficient of kinetic friction between the rod and rails is 0.100?

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For rod to moves with constant speed, kinetic friction force should be balanced by magnetic force on the rod. 

So, magnetic force should be horizontally in opposite direction of friction force, it means in the direction of velocity.

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