A circular loop of radius $0.0157\,m$ carries a current of $2.0\, amp$. The magnetic field at the centre of the loop is$({\mu _0} = 4\pi \times {10^{ - 7}}\,weber/amp - m)$
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(b) $B = \frac{{{\mu _0}}}{{4\pi }}\frac{{2\pi i}}{r} = {10^{ - 7}} \times \frac{{2\pi \times 2}}{{0.0157}} = 8 \times {10^{ - 5}}\,Wb/{m^2}$
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