energy density = 1/2 * o * E^2
= 1/2 * o * (Q/Ao ) ^2
= Q^2 / 2A^2o
= (75*10^-6)^2 / 2*0.25^2*8.85*10^-12
= 5084 J/m^3
Two large non-conducting plates of surface ares A - 0 25 m2 cay equal but opposate...
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