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Two insulating plates arc both uniformly charged in such a way that the potential difference between them is V_(2) - V_(1) = 20V (i.e. plate 2 is at a higher potential). The plate are separated by d = 0.1m and can be treated as infinitely large. An electron is released from rest on the inner surface of plate 1. What is its speed when it hits plate 2 ? (e = 1.6xx10^(-19) C m_(e)= 9.11xx10^(-31) kg ) |
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Answer» `1.87xx10^(6) `m /s If v is velocity of electron when it hits the other plate 2, then `(1)/(2) MV^(2)= e(V_(2)-V_(1))` `=sqrt((2e(V_(2)-V_(1)))/(m))` `:. v= sqrt((2xx1.6xx10^(-19)xx20)/(9.11xx10^(-31)))` `:. v = 2.65 xx10^(6) ms^(-1)` 
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