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Force of magnetism does no work?

Hemichordate

Peds
10+ Year Member
May 5, 2008
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  1. Resident [Any Field]
I don't really understand why the force acting on a charge moving through a magnetic field does no work, yet is able to exert a force. Since it changes the direction of the particle, it changes its acceleration and therefore exerts a force, so how is it not doing work? (W=Fd)
 

inaccensa

Full Member
10+ Year Member
Sep 5, 2008
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  1. Medical Student
I don't really understand why the force acting on a charge moving through a magnetic field does no work, yet is able to exert a force. Since it changes the direction of the particle, it changes its acceleration and therefore exerts a force, so how is it not doing work? (W=Fd)


W= Fd costheta

The force is acting in a direction perpendicular to the direction of discplacement (you can think of the direction in which the particle is moving) From newtonian mechanics, work is done when the force acts along the direction of displacement or opp or at any angle other than 90, since cos 90= 0
 

Hemichordate

Peds
10+ Year Member
May 5, 2008
1,094
4
226
  1. Resident [Any Field]
W= Fd costheta

The force is acting in a direction perpendicular to the direction of discplacement (you can think of the direction in which the particle is moving) From newtonian mechanics, work is done when the force acts along the direction of displacement or opp or at any angle other than 90, since cos 90= 0

Ok, got it! Thanks.
 
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