The unit of Electric flux is N.(m^2)/C. But how is it , that the Flux density(which is nothing but flux per unit area) has a unit of C/(m^2).? Also , I have a book in Electromagnetic Engineering which states that "'electric displacement' and 'electric flux' are the same thing and both are equal to "Q" i.e the charge. It also states that the unit of flux is Coulomb.' Is all of this true?