Physics - Practical physics Question with Solution | TestHub

The length of a wire of a potentiometer is$100\mathrm{ }\mathrm{c}\mathrm{m}$and the emf of its standard cell is$\mathrm{E}$volt. It is employed to measured emf of a battery whose internal resistance is$0.5\mathrm{ }\mathrm{\Omega }$. If the balance point is obtained at$\mathcal{l}\mathcal{ }=\mathcal{ }30$cm from the positive end, the emf of the battery is -