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A battery is charged at a potential of 1...

A battery is charged at a potential of 15 V for 8 h when the current flowing is 10A. The battery on discharge supplies a current of 5A for 15h . The mean terminal voltage during discharge is 14V. The watt-hour efficiency of the battery is

A

0.825

B

0.8

C

0.9

D

0.875

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