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  4. Five cells each of emf E and internal resistance r are connected in series. Due to oversight one cell is connected wrongly. The equivalent internal resistance of the combination is

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Q. Five cells each of emf $E$ and internal resistance $r$ are connected in series. Due to oversight one cell is connected wrongly. The equivalent internal resistance of the combination is

Current Electricity

Solution:

All the internal resistances will be still in series, there will be no impact of polarity on the equivalent resistance