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Motional EMF (direction of moving bar)

  • #1
798
1

Homework Statement



Can someone please explain to me how to determine the direction of the veloicty of a bar that is conducting and inducing a current.

Fb=q(VxB)???
 

Answers and Replies

  • #3
798
1
Consider a conducting wire attached to a small weight. Fg acts to the right, and Fb (due to magnetic field perpendicular) is directed to the left. Say Fb>Fg. If the system is allowed to reach "steady state" why is the motional emf not Fb-Fg and directed to the right?
 
  • #4
798
1
The only reason I am asking is that I read that the magnetic force that develops due to a velocity always has to oppose it... Which doesnt seem like it would always be the case. Especially if there is a current passing through the wire such that it is that force giving it the acceleration.
 

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