An imaginary north pole of $10\,Am$ is rotating around an infinite long current carrying wire with $30\,revolution/min.$ on circular path. If current in wire is $5\,A$ then workdone in one second in doing so
Medium
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By $ACL$
$\oint \overrightarrow{\mathrm{B}} \cdot \overrightarrow{\mathrm{d} \ell}=\mu_{\mathrm{o}} \Sigma \mathrm{I}$
$\oint_{\mathrm{m}} \overrightarrow{\mathrm{B}} \cdot \overrightarrow{\mathrm{d}} \ell=\mathrm{m} \mu_{0}(\mathrm{I})$
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