Two cells each of emf E and internal resistance r 1 and r 2 respectively are connected in series with an external resistance R. The potential difference between the terminals of the first cell will be zero when R is equal to
A
B
C
r 1 – r 2
D
Text Solution
Verified by ExpertsThe correct answer is:
C
ε 1 – 
r 1 + r 2 + R = 2r 1
R = r 1 – r 2
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