A parallel plate capacitor with a capacitance C= 200x10^-12 consists of two copper plates, each with the area A=.40m^2 . They are maintained at a constant potential difference of V=5.0v by a battery. Calculate the potential(voltage) at a point exactly halfway between the plates. (Use the negative plate as the zero of potential,i.e., 0v . Step by step please..need help quickly.