A battery E of 4v a variable resistance Rn connected in series with the wire AB of yhe potentiometer. The length of the wire of the potentiometer is 100m when a cell of emf 1.5v is connected and no current flows through it E2 length of AC=60m find the potential difference between the ends A and B of the potentiometer 1. Does the high resistance R used in the secondary circuit affect the balance point Justify your answer