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If wire of length $L$ form a loop of radius $R$ and have $n$ turn. Find magnetic field at centre of loop if current flowing in loop is $I$
  • A$\frac{{{\mu _0}}}{{4\pi }}\frac{I}{{{R^2}}} \times {L^2}$
  • B$\frac{{{\mu _0}}}{{4\pi }}\frac{I}{{{R^2}}} \times L \times {n^2}$
  • C$\frac{{{\mu _0}I}}{{4\pi }}\frac{{4{\pi ^2}{n^2}}}{L}$
  • D$\frac{{{\mu _0}}}{{4\pi }}I\,4{\pi ^2}{n^2} \times L$
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