A galvanometer together with an unkonwn ...

A galvanometer together with an unkonwn resistance in series is connected across two identical cells, each of emf 1.5 V. When the cells are connected inseries, the galvanometer records a current of 1 A and when the cells are connected in parallel, the current =0.6 A. What is the internal resistance of each cell ?

`r=2/3Omega`

`r=2/5Omega`

`r=1/3Omega`

`r=3/2Omega`

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