A particle of mass `m` having negative charge `-q` is projected at an angle `theta` with `x`-axis
Channel: Doubtnut
Date: 19/01/2020

A particle of mass `m` having negative charge `-q` is projected at an angle `theta` with `x`-axis. There exists uniform electric field `E` and a unifrom magnetic field `B` along `x`-axis. The particle will return to its intial point once if (`n` is some integer)