the value of surface density on a conducting plate is -2 x 10^-6 C/m^2 . A 100eV electron moving towards the plate jut fails to strike it then the distance between the initial position of electron from the plate will be ??

Question

anonymous · Answer

@vanihba ? @ANKITOM

ujjwal · Answer

$$E=\frac{\sigma}{\varepsilon _0} $$$$E=\frac{V}{r}$$ Equalize both. you will get r. Here V is 100 V
Ans: 4.427*10^-4 m

anonymous · Answer

@ujjwal will u plz show me ur calculation i used the same formula but unable to get the answer...

experimentx · Answer

whats your answer??

anonymous · Answer

its a long calculation i left it.. :(

experimentx · Answer

http://hyperphysics.phy-astr.gsu.edu/hbase/electric/elesht.html

experimentx · Answer

@ujjwal 's method seems valid

anonymous · Answer

actaully guys i m stuck in this question by the statement 
"plate just fails to strike it then the distance between the initial position of electron from the plate will be "
i mean what they are trying to tell us can u guys show me the figure and ye @experimentX  ujj wals method is valid and i used the same way but unable to get answer :(

ujjwal · Answer

that is not a long calculation. you have values of $\sigma$  , $\varepsilon _0 $ and V.
just substitute values to get r in the equation
$$\frac{\sigma}{\varepsilon_0}=\frac{V}{r}$$

anonymous · Answer

yea i got it :P i dunno wat i m doing dat time have one more doubt hold on posting it and thnx for everyone :)

anonymous · Answer

http://openstudy.com/study#/updates/4fd62463e4b04bec7f172d30