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An electromagnetic field wave of frequency $\;1 \times 10^{14} \;$ hertz is propagating along z - axis . The amplitude of electric field is 4 V/m .If $\;\in_{0}=8.8 \times 10^{-12}\;C^{2}/N-m^{2}\;$ , then average energy density of electric field will be :

$(a)\;35.2 \times 10^{-10}\;J/m^{3} \qquad(b)\;35.2 \times 10^{-11}\;J/m^{3} \qquad(c)\;35.2 \times 10^{-12}\;J/m^{3} \qquad(d)\;35.2 \times 10^{-13}\;J/m^{3} $

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