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Capacitor question

2021 · 25 Feb · Shift 2 · Q50
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  5. /2021 · 25 Feb · Shift 2 · Q50

Capacitor question

2021 · 25 Feb · Shift 2 · Q50

JEE MainPhysicsCapacitorMCQ+4 / −1
An electron with kinetic energy K1 enters between parallel plates of a capacitor at an angle 'α\alphaα' with the plates. It leaves the plates at angle 'β\betaβ' with kinetic energy K2. Then the ratio of kinetic energies K1 : K2 will be :
  1. A
    cos⁡2βcos⁡2α{{{{\cos }^2}\beta } \over {{{\cos }^2}\alpha }}cos2αcos2β​
  2. B
    cos⁡βcos⁡α{{\cos \beta } \over {\cos \alpha }}cosαcosβ​
  3. C
    sin⁡2βcos⁡2α{{{{\sin }^2}\beta } \over {{{\cos }^2}\alpha }}cos2αsin2β​
  4. D
    cos⁡βsin⁡α{{\cos \beta } \over {\sin \alpha }}sinαcosβ​
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