1. The problem statement, all variables and given/known data If the separation between the plates of a parallel plate capacitor is doubled and the potential difference is held constant by a battery, the magnitude of the charge on the plates will: *a. double b. quadruple c. be cut in half d. not change 2. Relevant equations CV=Q C=εoA/2d 3. The attempt at a solution CV=Q C proportional to Q εoA/2d proportional to Q 1/d proportional to Q now if the separation d is doubled the charge Q should be cut in half instead of doubled (as the answer key says) right? so have I made a mistake? Is it supposed to be done differently?