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

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

Text Solution

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The correct Answer is:
`120^(@)`
`2m u cos. (theta)/(2) = 2mv`
`rArr v = u cos. (theta)/(2) = (u)/(2)`
`rArr "cos" (theta)/(2) = (1)/(2), (theta)/(2) = 60^(@), theta = 120^(@)`
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