Magnetic field intensity at the centre of coil of $50$ $turns$, radius $0.5\, m$ and carrying a current of $2\, A$ is
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(b) $B = \frac{{{\mu _0}Ni}}{{2r}} = \frac{{4\pi \times {{10}^{ - 7}} \times 50 \times 2}}{{2 \times 0.5}} = 1.25 \times {10^{ - 4}}\,T$
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