Physics - Current Electricity Question with Solution | TestHub

In the potentiometer circuit shown in the figure the internal resistance of the$6 \mathrm{V}$battery is$1 \mathrm{\Omega }$and length of the wire$\mathrm{AB}$is$100 \mathrm{cm}$. When$\mathrm{AD}=60\mathrm{ }\mathrm{cm}$, the galvanometer shows no deflection. The EMF of the cell$\mathrm{C}$is (the resistance of the wire$\mathrm{AB}$is$2 \mathrm{\Omega }$)