Two cells of same emf E but but internal resistance r1 and r2 are connected in series to an external resistance R . What would be the be the value of R so that the potential difference across the terminals of the first cell becomes zero . *
2 points
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A R = r1 - r2
B R = r1 + r2
C r1 r2
D none
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l will don't know
sorry.......
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