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An electron is projected as in figure with kinetic energy K, at an angle `theta=45^(@)` between two charged plates. The magnitude of the electric fiel

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An electron is projected as in figure with kinetic energy K, at an angle `theta=45^(@)` between two charged plates. The magnitude of the electric field so that the electron just fails to strike the upper plate, should be greater than:
image
A. `K/(qd)`
B. `(2K)/(qd)`
C. `K/(2qd)`
D. iInifinite
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Correct Answer - C
If particle will loose KE (in that direction) against work done by electric field `K/2=qEdrArr E=K/(2qd)`
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