Answer:
It is
known that \[\frac{1}{2}{{\in }_{0}}{{E}^{2}}\] represents energy density, i.e.,
energy per unit volume i.e. dimensions of
\[{{\in
}_{0}}{{E}^{2}}=\frac{energy}{volume}=\frac{force\,\times dis\tan
ce}{area\times length}=\frac{force}{area}=pressure\]
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