A Bar magnet is located in a uniform, constant magnetic field. What is the magne
ID: 2237881 • Letter: A
Question
A Bar magnet is located in a uniform, constant magnetic field. What is the magnetic force or forces acting on the bar magnet due to the uniform magnetic field? How is the magnetic bar going to move in the uniform magnetic field? Before the field was applied, the bar was _NOT_ moving If the same bar magnet would be located in a magnetic field that does not change, but is not uniform, then what kind of forces is acting on it? What would be the motion of the magnet bar in the field that is not uniform?Explanation / Answer
a) the force acting on each pole of the magnet will be F = m B, where 'm' is the pole strength and B is the strength of magnetic field.
b) due to uniform magnetic field the bar magnet experiences a moment couple and tries to rotate in the filed, however, there will be no translatory motion.
c) If the magnetic field of the first magnet is nonuniform (such as the H near one of its poles), each pole of the second magnet sees a different field and is subject to a different force. This difference in the two forces moves the magnet in the direction of increasing magnetic field and may also cause a net torque.
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