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 $({\mu _0} = 4\pi \times {10^{ - 7}}\,weber/ampere - metre)$
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(a) $B = \frac{{{\mu _0}Ni}}{{2r}} = \frac{{4\pi \times {{10}^{ - 7}} \times 100 \times 0.1}}{{2 \times 5 \times {{10}^{ - 2}}}}$ $ = 4\pi \times {10^{ - 5}}$ $Tesla$
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