An electron with kinetic energy...|CAPACITANCE|JEE-Main 2021

JEE MAIN 2021

25-02-2021 S2

Question

An electron with kinetic energy $K_1$ enters between parallel plates of a capacitor at an angle ' $\alpha$ ' with the plates. It leaves the plates at angle ' $\beta$ ' with kinetic energy $\mathrm{K}_2$. Then the ratio of kinetic energies $\mathrm{K}_1: \mathrm{K}_2$ will be :

Select the correct option:

$\frac{\sin ^2 \beta}{\cos ^2 \alpha}$

$\frac{\cos ^2 \theta}{\cos ^2 \theta}$

$\frac{\cos \beta}{\cos \alpha}$

$\frac{\cos \beta}{\sin \alpha}$

✓ Correct! Well done.

✗ Incorrect. Try again or view the solution.

Solution