Jee Main
Electromagnetic Waves
JEE Main 2022 (Online) 26th July Evening Shift
MCQ+4 / -12022
A velocity selector consists of electric field \(\vec{E}=E \,\hat{k}\) and magnetic field \(\vec{B}=B \,\hat{j}\) with \(B=12 \,m T\). The value of \(E\) required for an electron of energy \(728 \,\mathrm{e} V\) moving along the positive \(x\)-axis to pass undeflected is :
(Given, mass of electron \(=9.1 \times 10^{-31} \mathrm{~kg}\) )