Question based on a video (battery and voltage)

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SammyS
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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.
First, think.

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 Vy 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.
 

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