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The magnetic field to a small magnetic d...

The magnetic field to a small magnetic dipole of magnetic moment `M`, at distance r from the centre on the equatorial line is given by (in M.K.S. system)

A

`(mu_(0))/(4pi) .(M)/(r^(2))`

B

`(mu_(0))/(4pi). (M)/(r^(3))`

C

`(mu_(0))/(4pi).(2M)/(r^(3))`

D

`(mu_(0))/(4pi) . (2M)/(r^(2))`

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