A 10 wire potentiometer has first five wires of cross sectional radius `r` and next five wires of radius `2r`. The wires are uniform and made of same material. An ideal cell of emf `2 V` is connected across the potentiometer wire. What length of the potentiometer wire will balance the emf of– (a) a Daniell cell (emf = 1.0 V) (b) a Lechlanche cell (emf = 1.5 V) (c) a cell of emf 1.8 V ? Length of each wire is 100 cm.

A 10 wire potentiometer has first five wires of cross sectional radius

1.	A 10 wire potentiometer has first five wires of cross sectional radius `r` and next five wires of radius `2r`. The wires are uniform and made of same material. An ideal cell of emf `2 V` is connected across the potentiometer wire. What length of the potentiometer wire will balance the emf of– (a) a Daniell cell (emf = 1.0 V) (b) a Lechlanche cell (emf = 1.5 V) (c) a cell of emf 1.8 V ? Length of each wire is 100 cm.
Answer» Correct Answer - (a) 3.125 (b) 4.688 m (c) 7.5 m

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