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An accumulator battery before charging, had an e.m.f. of 90 V, and after charging, 100 V. The initial charging current was 10 A. What was the current at the end of the charging if the internal resistance of the battery during the entire charging period can be taken as constant and equal to 2Ω, and if the voltage of the charging station is also regarded as being constant?  

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Answer: 5 amperes.

Explanation:

The voltage from the charging station is determined from the initial charging conditions:

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