- #51

SammyS

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First, think.When I thought it is ##V_+## - ##V_-##

By ##V_+## I mean potential at either x or y whichever is at greater (positive potential ).

(##Q_1## - ##Q_2##)/(##C_1## + ##C_2## )This formula just gives potential difference and does not specify anything about which point is at greater potential.This is what thought.

The above formula

**does**specify which is at higher potential.

If ##\ Q_1< Q_2 \,,\ ## then ##\ Q_1- Q_2 \ ## and ##\ V_x- V_y \ ## are negative meaning V

_{y}becomes the V

_{+}.

I wrote there will be potential different between points x and y given by (##Q_1## - ##Q_2##)/(##C_1## + ##C_2## ) because at that time I knew x is at greater potential.