Two Large Metal plates of area $1.0$ $m^2$ face each other. They are $5$ $cm$ apart and carry equal and opposite charge on their inner surfaces. If $E$ between the plates is $55$ $N/C$, what is charge on the plates? Neglect edge effects.
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This is blatently homework!
See http://hyperphysics.phy-astr.gsu.edu/hbase/electric/pplate.html for how to work out the capacitance of the plates.