Answer
$u=1.6\frac{J}{m^3}$
Work Step by Step
The energy density is given as
$u=\frac{1}{2}\epsilon_{\circ}E^2$
$u=\frac{1}{2}(8.85\times10^{-12})(600000)^2$
$u=1.6\frac{J}{m^3}$
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