In hydrogen atom, the electron makes $6.6 \times {10^{15}}$ revolutions per second around the nucleus in an orbit of radius $0.5 \times {10^{ - 10}}\,m$. It is equivalent to a current nearly
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(b) $i = qv $$ = 1.6 \times {10^{ - 19}} \times 6.6 \times {10^{15}}$$ = 10.56 \times {10^{ - 4}}A = 1\,mA$
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