An electron gun `G` emits electron of energy `2kev` traveling in the positive `x`-direction.The elec
Channel: Doubtnut
Date: 2020-01-26

An electron gun `G` emits electron of energy `2kev` traveling in the positive `x`-direction.The electrons are required to hit the spot `S` where `GS=0.1 m` and the line `GS` makes an angle of `60^(@)` with the `x`-axis, as shown in the fig.A uniform magnetic field `vecB` parallel to `GS` exists in the region outside of electron gun.Find the minimum value of `B` needed to make the electron hit `S`.[Take mass of electron`=9xx10^(-31)kg`]