- #1
kuokius
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Homework Statement
Uncharged metal plate area S and thickness d located at a distance r from the point charge q and oriented perpendicular to the vector r, as shown below. Find the electric force between the plate and the charge.
The plate thickness is less, and the distance r is much greater than the linear dimensions of the plate.
http://s8.postimg.org/62esehalx/Untitled.png
Homework Equations
[tex] F = \frac{kq_1q_2}{r^2} [/tex]
[tex] E = \frac{\sigma}{2\epsilon_0} [/tex]
The Attempt at a Solution
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If considering a metal plate as a charge Q (because r is much greater than the linear dimensions of the plate) then the force between them would be:
[tex] F = \frac{kqQ}{r^2} [/tex]
[tex] Q = \sigma S [/tex]
And that's where I stop. I don't know how to find surface charge density.