A bar magnet is located in a uniform, constant magnetic field. What is the magne

Question

A bar magnet is located in a uniform, constant magnetic field. What is the magnetic force acting on the bar magnet located in the uniform magnetic field?

How is the magnet bar going to move in the uniform magnetic field? Before the magnetic field was applied, the bar was not moving.

Someone tries to increase the magnetic field inside a coil by adding more turns to the coil, but keeping the same current in the coil. Where should he add more turns: to the end of the coil (i.e., to make it longer) or to the next layer on the top of the existing coil layers (i.e., to make it thicker)? Justify your answer.

Please answer all parts of the question with thorough explanation to receive best answer! Thanks.

Explanation / Answer

a) net force acting on the bar magnet F=0

b) the bar would rotate as the magnetic filed would apply a torque on the bar

c) he should add it on the top of the exixting coil

as this would add to the magnetic field generated by the first coil and also decrease the resistnace of the coil

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