The electron with charge (q = 1.6 × 10-19 C) moves in an orbit of radius 5 × 10-11 m with a speed of 2.2 × 106 ms-1, around an atom. The equivalent current is:

1.12 × 10-6 A 1.12 × 10-3 A 1.12 × 10-9 A 1.12 A

1.12 × 10-3 A

Current, i = qf = $q\left(\frac{v}{2 \pi r}\right)=\frac{1.6 \times 10^{-19}\left(2.2 \times 10^6\right)}{(2 \pi)\left(5 \times 10^{-11}\right)}$ = 1.12 × 10-3 A