Question about electromagnet induction in a coill.

AI Thread Summary
Rotating a bar magnet sideways in a coil does not produce an alternating current due to the cylindrical symmetry of a perfect magnetic dipole, which remains unchanged when rotated about its axis. The number of turns in the coil can influence the induced voltage, but the rotation itself does not create AC current. Moving a magnet through a coil in one direction and then the opposite does generate an alternating current. If the magnet is oriented differently, the behavior may change, but the fundamental principles of electromagnetic induction remain constant. Understanding these concepts is crucial for applications in electromagnetism and electrical engineering.
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If you have a bar magnet in a coil and rotate it sideways (poles on the side of the magnet) does it produce an alternating current and do the number of turns in the coil affect this, and if you move a magnet through a coil one way and then the other, does it produce an ac current?
 
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If you are representing your bar magnet as a perfect magnetic dipole (which is a valid representation in some cases), then your answer is no, since the field of a perfect magnetic dipole has cylindrical symmetry and will be unchanged when rotated about it's axis.
 
What if the magnet was facing the other way?
 

Thread 'Why measure the speed of light in one direction?'

It may be shown from the equations of electromagnetism, by James Clerk Maxwell in the 1860’s, that the speed of light in the vacuum of free space is related to electric permittivity (ϵ) and magnetic permeability (μ) by the equation: c=1/√( μ ϵ ) . This value is a constant for the vacuum of free space and is independent of the motion of the observer. It was this fact, in part, that led Albert Einstein to Special Relativity.
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