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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(c) The magnetic field at the centre of the circle $ = \frac{{{\mu _o}}}{{4\pi }} \times \frac{{2\pi i}}{r} = {10^{ - 7}} \times \frac{{2\pi (nq)}}{r} = \frac{{2\pi nq}}{r} \times {10^{ - 7}}\,N/A{\rm{ - }}m$
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