As shown earlier, the strength of the poles depends upon the shape and characteristics of the magnet.
Usually the artificial magnets are made by rubbing or stroking an iron pieces with a permanent magnet are not as strong in magnetic sense as, say, a magnet made by circulating currents along a wire wound round the iron piece.
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| Magnet made by Rubbing |
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| Magnet made by Stroking |
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| Magnet made by Circulating Electric Current |
In fact, the strongest magnets are made by the electric currents.
In magnetism, one can say that the magnetic pole strength of an electromagnet is far greater than that of a magnet made by rubbing or stroking an iron piece with a permanent magnet.
Usually pole strength of a magnet is denoted by m.
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