we know that electrical field strength,E,can be counted by equation 1. E=V/d,or 2. E=Qq/4[tex]\pi[/tex][tex]\epsilon[/tex]r 2 In the circuit with capacitor, the potential difference ,V is decided by battery.So from the first equation ,the E is not affected by permittivity(dielectric material) but it does affected according to second equation. What is the correct explanation of the electrical force between plates??