A particle of mass $10^{-3} \mathrm{~kg}$ and charge $5 \mu \mathrm{C}$ is thrown at a speed of $20

Question

A particle of mass $10^{-3} \mathrm{~kg}$ and charge $5 \mu \mathrm{C}$ is thrown at a speed of $20 \mathrm{~m} / \mathrm{sec}$ against a uniform electric field of strength $2 	imes 10^5 \mathrm{NC}^{-1}$. The distance travelled by particle before coming to rest is

Professor PC Thomas Classes · Answer

Acceleration $a = \frac{qE}{m} = 1000 	ext{ m/s}^2$. Stopping distance $s = \frac{v^2}{2a} = \frac{400}{2000} = 0.2 	ext{ m}$.