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Ok, everyone knows what an electromagnet is--the most obvious example being wire coils around a nail through which a charge is passed. If you had a hollow cylinder, and the coils were wrapped around the outside; how would the magnetic field be shaped?
Illustration (Please assume that there are more coils than shown and that the right side of the cylinder is not slanted.):
|--> |
|---> |
|----> |
Illustration (Please assume that there are more coils than shown and that the right side of the cylinder is not slanted.):
|--> |
|---> |
|----> |