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The magnetic field at the centre of current carrying coil is
  • A$\frac{{{\mu _0}ni}}{{2r}}$
  • B$\frac{{{\mu _0}}}{{2\pi }}\frac{{ni}}{r}$
  • C$\frac{{{\mu _0}ni}}{{4r}}$
  • D${\mu _0}ni$
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