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I know that energy stored in electric field / unit volume = 1/2 ε E

so can I say that for any configuration calculating ∫ ½ ε E

for instance

for →

Q

° Q

∫ ½ ε E

^{2}so can I say that for any configuration calculating ∫ ½ ε E

^{2}over whole space - gives me the potential energy stored stored in the systemfor instance

for →

Q

_{1}°° Q

_{2}...separated by distance 'd'∫ ½ ε E

^{2}over whole space = KQ_{1}Q_{2}/ d
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