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# CBSE Class 12-science Answered

Sir pl answer
Asked by jain.pradeep | 29 Feb, 2020, 10:45: AM
Expert Answer
current in the circuit , i = ( 2E ) / [ r1 + r2 + R ]

Voltage across terminals A and B of first cell is zero , hence we get ,  E - i r1 = 0

E - { 2E / [ r1 + r2 + R ] } r1  = 0

By simplifying above equation, we get, R = r1 - r2

Answered by Thiyagarajan K | 29 Feb, 2020, 05:26: PM

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