A charge Q is uniformly distributed over a la | vedclass

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(C) For a large conducting plate (copper),the charge $Q$ distributes on both sides of the plate. The surface charge density on each side is $\sigma =

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$10$

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(C) For a large conducting plate (copper),the charge $Q$ distributes on both sides of the plate. The surface charge density on each side is $\sigma = \frac{Q}{2A}$. The electric field near the surface is $E = \frac{\sigma}{\epsilon_0} = \frac{Q}{2A\epsilon_0} = 10 \ V/m$.For a non-conducting plate (plastic),the charge $Q$ is fixed on the surface where it is placed. If the charge is distributed over the entire surface area $A$,the surface charge density is $\sigma' = \frac{Q}{A}$. The electric field due to a non-conducting sheet is $E' = \frac{\sigma'}{2\epsilon_0} = \frac{Q}{2A\epsilon_0}$.Comparing the two expressions,we see that $E' = E = 10 \ V/m$.

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