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The magnetic field due to short bar magn...

The magnetic field due to short bar magnet of magnetic dipole moment M and length 2l, on the axis at a distance z (where z >> I) from the centre of the magnet is given by formula ....

A

`(mu_0M)/(4pi z^3) hatm`

B

`(2mu_0 M)/(4pi z^3) hatM`

C

`(4pi M)/(mu_0 z^3) hatM`

D

`(mu_0 M)/(2pi z^3) hatM`

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