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Q.

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

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a

8.0 V

b

11.5 V

c

5.0 V

d

11.0 V

answer is C.

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Detailed Solution

V=ε+(εaε)rR+r=8.0+(1208)×0.516=8.0+3.5=11.5volt

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