Find the force on each wire

  • #1
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Homework Statement


Two wires AD and DC are put in the magnetic field with induction B=0.01T so that they form the angle pi/3 radian and the extremities A and C are in the same force line (what does it mean???). In the wires passes the current I=2A (intensity). Find the forces with which the field acts on each wire. (SOLUTION: 8.5*10^-4 N)

Homework Equations


F=B*l(intensity)*l(length)*sin alpha

The Attempt at a Solution


What does be in the same force line mean and how does it affect the problem and the equations?. I don't know how to find the length and how to use the fact that the angle is pi/3 radian
 

Answers and Replies

  • #2
andrewkirk
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The force lines are the lines showing the direction in which the magnetic field flows. Imagine that in the number plane the mag field (which we assume is uniform, although the question does not state that) flows in the positive y direction (ie up). Then the statement 'extremities A and C are in the same force line' means that A and C have the same y coordinate.

The trouble is that the problem is not fully specified, because we do not know the relative lengths of AD and DC. If they are the same then the triangle ADC will be equilateral and the forces on the two wires will be of equal magnitude but opposite direction. If the lengths are not the same then the triangle will not be equilateral, the angles the wires make with the force lines will be different, and the magnitude of the forces will be different.
 
  • #3
NascentOxygen
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(SOLUTION: 8.5*10^-4 N)
It seems they share a common answer…so first try equal lengths. Might also have to look at determining force per unit length?
 

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