Consider a parallel plate capacitor connected to a battery. You move the plates closer to each other. Will you do positive or negative work?
The Attempt at a Solution
As the plates are moved closer to each other, capacitance increases which increases the stored energy (V is constant). We know that electrostatic potential energy is defined as the negative of the work done by the electric field. Ufinal - Uinitial is positive in this case. So work done by field is negative. Therefore work done by external agent (us) should be positive.
BUT THE ANSWER IS NEGATIVE WORK!!! please help