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
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
- A
$\frac{{2\pi q}}{{nr}} \times {10^{ - 7}}\frac{N}{{A - m}}$
- B
$\frac{{2\pi q}}{r} \times {10^{ - 7}}\frac{N}{{A - m}}$
- C
$\frac{{2\pi nq}}{r} \times {10^{ - 7}}\frac{N}{{A - m}}$
- D
$\frac{{2\pi q}}{r}\frac{N}{{A - m}}$
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