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 $=9.1 \times 10^{-31} \mathrm{~kg}$ )

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 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 $=9.1 \times 10^{-31} \mathrm{~kg}$ )

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

$192 \,\mathrm{mVm}^{-1}$

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

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

Solution

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