A battery of emf Eo=12 V is connected across a 4 m long uniform wire having resistance 4 Ω/m. Two cells of small emfs ε1=2Vand ε2=4V having internal resistance 2Ω and 6Ω respectively are connected as shown in the figure. If galvanometer shows no deflection at the point N, the distance of point N from the point A is equal to