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Two batteries with e.m.f. 12 V and 13 V are connected in parallel across a load resistor of 10 Ω. The internal resistances of the two batteries are 1 Ω and 2 Ω respectively. The voltage across the load lies between: (1) 11.6 V and 11.7 V (2) 11.5 V and 11.6 V (3) 11.4 V and 11.5 V (4) 11.7 V and 11.8 V
- 11.6 V and 11.7 V
- 11.5 V and 11.6 V
- 11.4 V and 11.5 V
- 11.7 V and 11.8 V
Correct answer: 11.5 V and 11.6 V
Solution
The correct option is right because when calculating the voltage across the load resistor, the combined effect of the e.m.f.s and the internal resistances of the batteries results in a voltage drop that falls within the range of 11.5 V to 11.6 V, considering the parallel connection and the load resistance.
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