The magnetic moment of a circular coil carrying current is
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(c) $M = NiA \Rightarrow M \propto A$$ \Rightarrow M \propto {r^2}$$\left( {{\rm{As}}\;l = 2\pi r \Rightarrow l \propto r} \right)$
$==>$ $M \propto {l^2}$
$==>$ $M \propto {l^2}$
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