1. The problem statement, all variables and given/known data If the 2 charged capacitors are reconnected in parallel with plates of opposite polarity together then ? is common potential. In this condition how charge is conserved and same potential is maintained 2. Relevant equations Net charge Q=C1V1-C2V2 Where C1V1=q1 and C2v2=q2 V = (C1V1-C2V2)/(C1+C2) Where C1 and V1 are capacitance and potential of one and C2 and V2 are of other? 3. The attempt at a solution I solved but got confused in how they will attain same potential with charge conservation. Initially in a system net charge was q1+q2 but after combination it was q1-q2. Please describe the soln with description for charge conservation and common potential.