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A storage battery of emf 8.0 V and internal resistance $0.5 Ω$ is being charged by a 120 V dc supply using a series resistor of $15.5 Ω$ . What is the terminal voltage of the battery during charging?

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11.5 V

4.5 V

8 V

10 V

answer is A.

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Detailed Solution

$120 = 8 + I (0.5 + 15.5)$

I=7A

the terminal voltage of the battery during charging is 8+(7)(0.5)=11.5 V

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