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Engineering
Electrical Engineering
Difference in these two concepts of Magnetic Torque
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[QUOTE="etotheipi, post: 6377092"] A current carrying loop has a magnetic moment ##\vec{m} = I\vec{A}##. It is correct that in an external magnetic field a couple ##\vec{\tau} = \vec{m} \times \vec{B}## is exerted on the loop. If you like, you can think of a magnetic moment equivalently as two opposite magnetic poles of magnitude ##p## separated by a vector ##\vec{l}##, such that$$\vec{m} = p\vec{l}$$This is more natural for e.g. a bar magnet, but I suppose there is nothing stopping you from thinking about the current carrying loop in terms of magnetic poles. Are you saying that, e.g. the external magnetic field is produced by another bar magnet, whose north pole (say) is repelling the effective north pole of the current carrying loop. I suppose that is a fine analogy, but it's probably not really helpful to think of current carrying loops in terms of magnetic poles. [/QUOTE]
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Difference in these two concepts of Magnetic Torque
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