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Q.

‘n’ identical cells, each of e.m.f ‘E’ and internal resistance ‘r ’, are formed in series to form a closed circuit. One cell ‘A’ is joined with reversed polarity. The potential difference across each cell, except A, is

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a

2En

b

n−1nE

c

2nn−2E

d

n−2nE

answer is A.

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Detailed Solution

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i=(n−2)Enr 

VB−VA=−ir+E

=E−(n−2)Enrr

=2En

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