In the given circuit AB is a uniform wire of 10 W and length 1 m. It is connected to series arrangment of cell E1 of e.m.f 2 V and negligible internal resistance and a resistor R. Terminal A is also connected to an electrochemical cell E2 of e.m.f 100 m V and galvanometer G. In this set up a balancing point is obtaiend at 40 cm mark from A. Calculate the resistance of R. If E2 were to have an e.m.f of 300 mV where will you expect the balancing point to be?
