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## Homework Statement

an electron with mass m = 9.11 x 10^-31 is released at rest near a very large positively charged non-conducting charged sheet lying horizontally. What should the surface charge density on this sheet be to keep the electron balanced at rest above the ground? Is it above or below the sheet?

## Homework Equations

F = qE

d(density) = Eϵ

## The Attempt at a Solution

qE = mg

E = (mg)/ q

d = Eϵ

d = (mgϵ )/q

When I plug in all my values I get 4.938 x 10^-22 C/m^2

but the answer is 9.88 x 10^-22 (if I multiply my answer by 2 it would be right but I dont think thats how I need to do it.)