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An electron with kinetic energy \(K_1\) enters between parallel plates of a capacitor at angle ' \(\alpha\) ' with the p…

Q1

An electron with kinetic energy \(K_1\) enters between parallel plates of a capacitor at angle ' \(\alpha\) ' with the plates. It leaves the plates at angle ' \(\beta\) ' with kinetic energy \(K_2\). Then the ratio of kinetic energies \(K_1: K_2\) will be:

[JEE Main 2021, 25 Feb (Shift 2)]

a

\(\frac{\sin ^2 \beta}{\cos ^2 \alpha}\)

b

\(\frac{\cos \beta}{\cos \alpha}\)

c

\(\frac{\cos \beta}{\sin \alpha}\)

d

\(\frac{\cos ^2 \beta}{\cos ^2 \alpha}\)

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