@t_n_k, Thanks for the reply. This wikipedia article says E = -V/x.
The minus sign simply alerts one to the situation that the electric field points in the direction of decreasing electric potential. The direction an unbounded (free) positive charge would move in the presence of the field.@t_n_k, Thanks for the reply. This wikipedia article says E = -V/x.
Please see my attachment which depicts the derivation of capacitance of a parallel plate capacitor filled with dielectric medium. This derivation uses the formula V = Ex, while calculating the potential , when work is being done in moving charge in space filled with air and in space filled with dielectric medium. Thats why i raised the query.