# In a hydrogen atom, electron moves in an orbit of radius 5 × 10^(-11) m with a speed of 2.2 × 10^6 m/s…

Q: In a hydrogen atom, electron moves in an orbit of radius 5 × 10-11 m with a speed of 2.2 × 106 m/s. Calculate the equivalent current.

Sol. Current $\large i = \frac{e}{T}$

$\large i = \frac{e}{2\pi r/ v }$

$\large i = \frac{e v}{2\pi r}$

$\large i = \frac{1.6 \times 10^{-19} \times 2.2 \times 10^6}{2\pi \times 5 \times 10^{-11}}$

= 1.12 × 10-3 amp = 1.12 mA.