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Jan3-13, 12:12 AM
P: 10
Quote Quote by BruceW View Post
Another way to work it out is if we give our magnets a specific form. For example, the magnets might be made of solenoids. In this case, you can work out the Lorentz force on the charged particles in the wire of the solenoid, and you can work out the force on the 'magnet' (i.e. solenoid), which gives the same answer as the other method.
I took a look at your solenoid example and found that all the forces on the solenoids cancel out. Here is a picture of the top part of the loop. A similar picture can be drawn for the bottom part of the loop.

Edit: The effect is similar to a compass needle aligning with Earth's magnetic field