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A fully discharged battery (emf = 12V, capacity 60 Ampere hour) is connected with a charging device that can supply the battery a steady current i = 3A. Battery is connected to charging device for 90 minutes. Final charging level of battery (in percentage) is:

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7.5%

10%

75%

15%

answer is A.

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Detailed Solution

t =1.5h
Total charge transferred $= 4 .5 Ah$
$Q_{max} = 60 Ah$
Percentage charged $= \frac{4 .5}{60} \times 100 = 7 .5 %$

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