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
Text Solution
Verified by ExpertsThe correct answer is:
D
When all cells are connected correctly; then equivalent emf of the combination is
and effective internal resistance of the combination is 
As one wrongly connected cell decreases the equivalent emf by 2E whereas effective internal resistance remains the same. So
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