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Olympiad workbook

Exam: Olympiad workbook
Subject: NSEP
Chapter: Magnetic Effects of Current

Olympiad workbook · NSEP · Magnetic Effects of Current

An insulating rod of length/carries a charge q distributed...

An insulating rod of length/carries a charge

q

distributed uniformly all over its length. The rod is pivoted at its midpoint and is rotated at a frequency

f(

in Hz

)

about an axis perpendicular to the rod passing through the point at the pivot. The magnetic moment of the system is

Options

A $\frac{1}{12} \pi \mathrm{q} f \ell^2$
B $\frac{1}{6} \pi \mathrm{q} f \ell^2$
C $\frac{1}{3} \pi \mathrm{q} f \ell^2$
D $\frac{\mathrm{r}^2}{\mathrm{R}^2}$

Correct answer

A. $\frac{1}{12} \pi \mathrm{q} f \ell^2$

Step-by-step solution

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