What kind of current will be produced if a bar magnet is rotated in a copper coil?
Since the magnet is spinning, a single point on the coil is subjected to a field that alternates positive and negative. Therefore the current in the coil will alternate the induced current, i.e., the induced current will be AC.
Anyway, the good news is I've figured out how to fix the problem and have since customised this blog the way I want it to appear; and here I wish to share with all how I did it.
No matter how you move the magnet it must produce AC in the coil. There are only two solutions to this. Either a mechanical switching eg a commutator, or an electronic one such as a rectifier. This is because the EMF is produced by a CHANGE in the magnetic flux. If you increase it at some time then you must reduce it again at some later time so the direction of the EMF must alter. No matter how you do it.
