Electric Field Due to Charge Distributions - Approach
An electron i...
Question
An electron is projected as shown in the figure, with kinetic energy K, at an angle θ=45∘ between two charged plates. Ignore the gravity. At what distance from the starting point will the electron strike the lower plate?
A
d
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B
2d
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C
3d
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D
4d
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Solution
The correct option is D4d Let R be the range of the projectile. Hmax≤d, where Hmax= maximum height electron can travel
⟹u2sin2θ2a=d
As θ=45∘ ⟹d=u24a......(i) We know that range R is given by R=u2sin2θa ⟹R=u2a.......................(ii) ∴ From (i) and (ii) we can say R=4d