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Write an expression of magnitude of magn...

Write an expression of magnitude of magnetic field at point lies on equatorial line of a bar magnet.

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`B= (mu_(0) m)/( 4 pi r^(3))`
where `(mu_0)/( 4 pi )=` constant
`m=` magnetic dipole moment
`r=` perpendicular distance from the mid point of magnet
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