`I = (2E)/(r_(1) + R + r_(2))` `V = E - ir` `rArr V = E -(2Er_(1))/(r_(1) + r_(2) + R)` `rArr 0 = (Er_(1) + Er_(2) + ER - 2Er_(1))/(r_(1) + r_(2) + R)` `rArr E(r_(2) + R - r_(1))= 0` `rArr R = r_(1) - r_(2)`
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