In a hydrogen atom, an electron moves in a circular orbit of radius $5.2 \times {10^{ - 11}}\,m$ and produces a magnetic induction of $12.56\, T$ at its nucleus. The current produced by the motion of the electron will be (Given ${\mu _0} = 4\pi \times {10^{ - 7}}\,Wb/A - m)$
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(d) $B = \frac{{{\mu _0}}}{{4\pi }}.\frac{{2\pi i}}{r} \Rightarrow 12.56 = {10^{ - 7}} \times \frac{{2\pi \times i}}{{5.2 \times {{10}^{ - 11}}}}$
$ \Rightarrow i = 1.04 \times {10^{ - 3}}\,A$
$ \Rightarrow i = 1.04 \times {10^{ - 3}}\,A$
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