First slide

potentiometer

Question

In a potentiometer, the balancing length of a cell of emf 10 volt is 120 cm. What will be the balancing length of potentiometer wire for a 8 volt cell?

Easy

A

82 cm
B

88 cm
C

104 cm
D

96 cm

Solution

For potentiometer the balancing length is proportional to emf in the secondary circuit
$\frac{8}{10} = \frac{x}{120} \Rightarrow x = 96 c m$

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