Current Electricity and Electrical InstrumentHard

Question

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

Options

A. V
B.not defined
C.15 V
D.10 V

Solution


For ideal r → 0
E =
E = 10 V

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