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The force experienced by a magnetic pole...

The force experienced by a magnetic pole of strength m kept at a distance of d from the centre of a short magnet of magnetic moment M on its equatorial line is

1) `m(mu_(0)M)/(4 pi d^(3))`

2) `m(mu_(0)2M)/(4 pi d^(3))`

3) `(1)/(m)(mu_(0)2M)/(4 pi d^(3))`

4) `(1)/(m)(mu_(0)2)/(4 pi Md^(3))`

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