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Obtain an expression for the magnetic dipole moment of current loop.

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We know that magnetic induction on the axial line of a circular coil is B

where N = Number of turns in the coil

R = Radius of the coil

x = Distance from centre of the coil

i = Current in a coil

We know that magnetic induction field on the axial line of a bar magnet

Comparing the equations (1) and (2)

Magnetic moment (M) = NiA

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