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Four identical cells of emf E and internal resistance r are to be connected in series. Suppose if one of the cell is connected wrongly. The equivalent emf and effective internal resistance of the combination is

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2E and 4r

4E and 4r

2E and 2r

4E and 2r

answer is A.

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Detailed Solution

2E and 4r

every wrong connection two cell's emf will be destroyed but internal resistance remain same.

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