A cubical volume is bounded by thces `x = 0, x = a, y = 0, y = a, z = 0, z = a.` The electric field in the region is given by `vecE=E_(0) times hat i` . Where `E_(0) = 4 xx 10^(4) NC^(–1) m^(–1)` . If a = `2cm,` the charge contained in the cubical volume is `Q xx 10^(–14) C.` The value of Q is ______ (Take `in _0= 9 × 10^(–12) C^(2) //Nm^(2))`