1. The problem statement, all variables and given/known data A capacitor has variable distance between the plates . It charges with a constant charge Q and the distance between the plates increase with 20%. How many percent does the energy change in the electric field between the plates? 2. Relevant equations E = (1/2)QV = (1/2)CV^2 = Q^2/2C 3. The attempt at a solution I remember my teacher said that the energy only depends on e. So the energy is the same.