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Question

# Two batteries with e.m.f 12 V and 13 V are connected in parallel across a load resistor of 10 Ω. The internal resistance of the two batteries are 1 Ω and 2 Ω respectively. The voltage across the load lies between

A
11.4 V and 11.5 V
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B
11.7 V and 11.8 V
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C
11.6 V and 11.7 V
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D
11.5 V and 11.6 V
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Solution

## The correct option is D 11.5 V and 11.6 V Equivalent EMF of two cells in parallel, Eeq=[E1r1+E2r2]req Eeq=121+13211+12 =37232=373V Req=23 + 10 Ω I=37323+10=373=3732A Voltage across load = IR=(3732)(10)=11.56 V

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