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Two large non-conducting plates of surface area of A=0.25m^2 carry equal but opposite charge Q=75mMicroC. What is the energy density of the electric field between the two plates?

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Electric field between two plates

E = q/A*eo

q = 75*10^-6 C

A = 0.25

eo = 8.85*10^-12

Energy density = 1/2*eo*(E^2) = 1/2*eo*(q/A*eo)^2 = [q^2] / [2*(A^2)*eo]

= [(75*10^-6)^2] / [2*(0.25)^2*8.85*10^-12]

= 5.1*10^3 J/m^3

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