An electron moving in a circular orbit of radius $r$ makes $n$ rotation per second. The magnetic field produced at the centre has a magnitude of

  • A

    $\frac{{{\mu _0}ne}}{{2r}}$

  • B

    $\frac{{{\mu _0}{n^2}e}}{{2r}}$

  • C

    $\frac{{{\mu _0}ne}}{{2\pi r}}$

  • D

    Zero

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