1. The problem statement, all variables and given/known data Zero deflection in galvanometer 2. Relevant equations If potential difference across between two points between which galvanometer is kept is zero galvanometer shows zero deflection. 3. The attempt at a solution But my doubt starts from this video at 3:33 to 3:44 teacher says that potential at p is same as potential at b,provided that connecting wires (represented in green color in video)are having no resistance.I think it can only happen if internal resistance of galvanometer is same as resistance between length AP.So that potential at p is same as potential at b,and galvanometer will show zero deflection.Am i right?