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 ($\mu_0 = 4\pi \times 10^{-7} weber/amp-metre$)
  • A$2 \times 10^{-5}\,, Tesla$
  • B$4 \times 10^{-5} \,Tesla$
  • C$8\pi \times 10^{-5}\, Tesla$
  • D$4\pi \times 10^{-5} \,Tesla$
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