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Two insulting plates are both uniformly ...

Two insulting plates are 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 plates are separated by `d=0.1m` and can be treated as infinity 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^-19C`, `m_e=9.11xx10^-31kg`)

A

(a) `2.65xx10^6m//s`

B

(b) `7.02xx10^12m//s`

C

(c) `1.87xx10^6m//s`

D

(d) `32xx10^-19m//s`

Text Solution

Verified by Experts

The correct Answer is:
A
`eV=1/2mv^2`
`impliesv=sqrt((2eV)/(m))=sqrt((2xx1.6xx10^-19xx20)/(9.1xx10^-31))`
`=2.65xx10^6m//s`
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