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Magnetic Effect of Current — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsMagnetic Effect of Current1 Mark
MCQ
A thin disc of radius $R$ and mass $M$ has charge $q$ uniformly distributed on it. It rotates with angular velocity $\omega$. The ratio of magnetic moment and angular momentum for the disc is
  • ✓
    $\frac{q}{2 M}$
  • B
    $\frac{R}{2 M}$
  • C
    $\frac{q^2}{2 M}$
  • D
    $\frac{2 M}{q}$
✓

Answer

Correct option: A.
$\frac{q}{2 M}$
(a)

Standard result $\frac{|\bar{M}|}{|\vec{L}|}=\frac{q}{2 M}$

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