Question: Q. 3. A square coil $O P Q R$, of side $a$, carrying a current $I$, is placed in the $Y-Z$ ‘plane’ as shown here. Find the magnetic moment associated with this coil.
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Solution:
Ans. The magnetic moment, associated with the coil is
$$ \begin{align*} N I A & =1 \times I \times a^{2} \ \vec{\mu}_{m} & =I a^{2} \hat{i} \text { along } x \text {-axis } \end{align*} $$