Current Electricity

A potentiometer wire has length of \(5 \mathrm{~m}\) and resistance of \(16 \Omega\). The driving cell has an e.m.f. of \(5 \mathrm{~V}\) and an internal resistance of \(4 \Omega\). When the two cells of e.m.f.s \(1.3 \mathrm{~V}\) and \(1.1 \mathrm{~V}\) are connected so as to assist each other and then oppose each other, the balancing lengths are respectively