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A 10 wire potentiometer has first five w...

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.

Text Solution

Verified by Experts

The correct Answer is:
(a) 3.125
(b) 4.688 m
(c) 7.5 m
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