$\alpha$ particle is revolving in radius $r$ with frequency $f$ then find value of magnetic dipole moment.
AIIMS 2019, Medium
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The magnetic dipole moment is calculated as,
$M=i \times \pi r^{2}$
$=\frac{2 e}{2 \pi r} \times v \times \pi r^{2}$
$=\frac{2 e v r}{2}$
$=e v r$
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