The magnetic moment of a current $(i)$ carrying circular coil of radius $(r)$ and number of turns $(n)$ varies as
A$1/ r^2$
B$1/ r$
C$r$
D$r^2$
AIIMS 2004, Easy
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D$r^2$
d (d) $M = niA = ni\left( {\pi {r^2}} \right) \Rightarrow M \propto {r^2}$
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