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Old Sep 23rd 2009, 05:31 PM   #1
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electric field between two plates

Two 10 cm x 10cm square plates that are charged with 12 nC and are 6 mm apart. What is the magnitude of the electric field between the two plates?


I need help setting up this problem because I honestly have no idea where to start and didn't see any similar problems in my physics book. Any help would be greatly appreciated.
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Old Sep 24th 2009, 02:37 AM   #2
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This is a pretty standard problem and has standard formula.

$\displaystyle E\ =\ \frac{\sigma}{\epsilon_0}$ .

where E is the electric field between the plates and $\displaystyle \sigma$ is the charge density or charge / unit area .

Remember all lengths should be in metres, areas in$\displaystyle m^2$ and charge in coulombs.

Google a bit and you will find plenty of stuff.
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Old Sep 24th 2009, 05:30 PM   #3
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I didn't really see anything when I googled the problem, that's why I asked about it. So I just use the formula? how do I find the charge density?
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Old Sep 24th 2009, 06:11 PM   #4
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Originally Posted by tag16 View Post
how do I find the charge density?
You are given the area of the plates and their total charge.
You want to know the amount of charge there is in a unit area. physicsquest said that you have to express charges in coulomb and unit area in $\displaystyle m^2$.

Yes, just use the formula physicsquest gave you.
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