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Statement of a problem № 3774

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A galvanometer together with an unknown resistance in series is connected across two identical batteries, each of 1.5 V. When the batteries are connected in series, the galvanometer records a current of 1 A and when the batteries are in parallel the current is 0.6 A. What is the internal resistance of the battery? [Indian Institute of Technology 1973]

Solution:
A galvanometer together with an unknown resistance in series is connected across

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