First slide

Magnetism

Question

The magnetic moment of a current carrying circular coil of radius (r) and number of turns (n) varies as

Moderate

A

$\frac{1}{r^{2}}$
B

$\frac{1}{r}$
C

$r$
D

$r^{2}$

Solution

$M = n I A = n I π r^{2} \Rightarrow M \propto r^{2}$

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