If 10 identical cells are connected in series, then current passing through a load resistance is I. If polarity of some cells are reversed, then current through load resistance is 
. Find the number of cells whose polarity has been changed.
Text Solution
Verified by ExpertsThe correct answer is:
C
If emf and internal resistance of each cells is E and r, respectively. Then,
If polarity of 
cells have been changed, then
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