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Question
When a current in a circular loop is equivalently replaced by a magnetic dipole,
Options
the pole strength m of each pole is fixed
the distance d between the poles is fixed
the product md is fixed
none of the above
Solution
the product md is fixed
When we replace a circular current-carrying loop with a magnetic dipole to resemble field lines of the circular loop, the pole strength m and the distance between the poles are not fixed.
But the magnetic dipole moment of both systems is always fixed. It is the product of the magnetic moment and the distance between the poles. In other words, md is fixed.
A current loop of area A and current I can be replaced with a magnetic dipole of dipole moment md.
i.e. md = IA
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