The magnetic induction in air at a point $1\,cm $ away from a long wire that carries a current of $1\,A$, will be
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(b) $B = \frac{{{\mu _0}}}{{4\pi }} \times \frac{{2i}}{r} = {10^{ - 7}} \times \frac{{2 \times 1}}{{{{10}^{ - 2}}}} = 2 \times {10^{ - 5}}$ $Tesla$
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