A long straight wire carries an electric current of $2\,A$. The magnetic induction at a perpendicular distance of $5\,m$ from the wire is
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(b) $B = {10^{ - 7}}\frac{{2i}}{r} = {10^{ - 7}} \times \frac{{2 \times 2}}{5} = 8 \times {10^{ - 8}}\,T$
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