A charge $q$ coulomb moves in a circle at $n$ revolutions per second and the radius of the circle is $r$ metre; then magnetic field at the centre of the circle is
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$\mathrm{B}=\frac{\mu_{0}}{4 \pi} \frac{\mathrm{i}}{\mathrm{r}} \times 2 \pi=\frac{\mu_{0}}{4 \pi} \frac{\mathrm{qn}}{\mathrm{r}} \times 2 \pi \quad(\because \mathrm{i}=\mathrm{qn})$
$=\frac{2 \pi \mathrm{qn}}{\mathrm{r}} \times 10^{-7}$
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