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A current of $0.1\, A$ circulates around a coil of $100$ $turns$ and having a radius equal to $5\, cm$. The magnetic field set up at the centre of the coil is $({\mu _0} = 4\pi \times {10^{ - 7}}\,weber/ampere - metre)$
  • A$4\pi \times {10^{ - 5}}\,tesla$
  • B$8\pi \times {10^{ - 5}}\,tesla$
  • C$4 \times {10^{ - 5}}\,tesla$
  • D$2 \times {10^{ - 5}}\,tesla$
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