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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:
A
$192 \mathrm{kVm}^{-1}$
B
$192 \mathrm{~m} \mathrm{Vm}^{-1}$
C
$9600 \mathrm{kVm}^{-1}$
D
$16 \mathrm{kVm}^{-1}$
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
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