An electron is projected as in figure with kinetic energy \( \mathr...

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An electron is projected as in figure with kinetic energy \( \mathrm{K} \), at an angle \( \theta=45^{\circ} \) between two charged plates. The magnitude of the electric field (uniform) so that the electron just fails to strike the upper plate, should be greater than
(A) \( \frac{K}{e d} \)
(B) \( \frac{2 \mathrm{~K}}{\mathrm{ed}} \)
(C) \( \frac{\mathrm{K}}{2 \mathrm{ed}} \)
(D) \( \frac{K}{4 e d} \)
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