WHAT IS THE POTENTIAL DIFFERENCE BETWEEN THE POINT A AND B AND PLEASE DON'T GIVE THIS ANSWER

THE STROONGER CELL IMPOSES ITS V ON OTHER BECAUSE IT DOESN'T OCCUR

2(E1+E2+E3).

PLZ TELL IF I AM WRONG.

the current in the resistance will be varying by applying kirchoff's law so how can we define or determine the pd between pts a and b

but i think that at t->infinity the system will reach a steady state and at that time pd between a and b will be    

(E1+E2+E3)

tell me if i m correct?????????