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Charge $q$ is uniformly spread on a thin ring of radius $R.$ The ring rotates about its axis with a uniform frequency $f\, Hz.$ The magnitude of magnetic induction at the center of the ring is
  • A$\frac{{{\mu _0}qf}}{{2\pi R}}$
  • B$\frac{{{\mu _0}qf}}{{2R}}$
  • C$\frac{{{\mu _0}q}}{{2fR}}$
  • D$\frac{{{\mu _0}q}}{{2\pi fR}}$
AIPMT 2011,AIPMT 2010, Medium
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