Physics · 2021
JEE Main · 25 February 2021, Shift 2 · Q10
An electron with kinetic energy K_1 enters between parallel plates of a capacitor at an angle ' α ' with the plates. It leaves the plates at angle '…
An electron with kinetic energy $\displaystyle \mathrm{K}_1$ enters between parallel plates of a capacitor at an angle ' $\displaystyle \alpha$ ' with the plates. It leaves the plates at angle ' $\displaystyle \beta$ ' with kinetic energy $\displaystyle \mathrm{K}_2$. Then the ratio of kinetic energies $\displaystyle \mathrm{K}_1: \mathrm{K}_2$ will be :
Official answer
(4)
$\displaystyle \frac{\cos ^2 \beta}{\cos ^2 \alpha}$
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JEE Main 2021 Physics question, with the answer from NTA’s final answer key. Where our answers come from.