Two cells of e.m.f. 10V & 15V are connec...

Two cells of e.m.f. 10V & 15V are connected in parallel to each other between points A&B. The cell of e.m.f. 10V is ideal but the cell of e.m.f. 15V has internal resistance `1Omega`. The equivalent e.m.f. between A and B is:

`25/2V`

not defined

15 V

10 V

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