A velocity selector consists electric |EMF| JEE-MAIN- 2022

JEE MAIN 2022

26.07.2022_S2

Question

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 $E$ required for an electron of energy 728 eV moving along the positive x-axis to pass undeflected is : (Given, mass of electron $=9.1 \times 10-31 \mathrm{~kg}$ )

Select the correct option:

$192 \mathrm{kVm}^{-1}$

$192 \mathrm{~m} \mathrm{Vm}^{-1}$

$9600 \mathrm{kVm}^{-1}$

$16 \mathrm{kVm}^{-1}$

✓ Correct! Well done.

✗ Incorrect. Try again or view the solution.

Solution