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Current $i$ is passed as shown in diagram. If radius of the circle is a, then the magnetic flux density at the centre $P$ will be:
  • A$\frac{{{\mu _0}i\alpha }}{{4\pi a}} \otimes $
  • B$\frac{{{\mu _0}i(2\pi  - \alpha )}}{{4\pi a}} \otimes $
  • C$\frac{{{\mu _0}i\,\sin \,\alpha }}{{2\pi a}} \otimes $
  • D$\frac{{{\mu _0}i\,\sin \,\alpha }}{{4\pi a}} \otimes $
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