First slide

potentiometer

Question

In a potentiometer experiment, the galvanometer shows no deflection when a cell is connected across 60 cm of the potentiometer wire. If the cell is shunted by a resistance of $6 Ω$ the balance is obtained across 50 cm of the wire. The internal resistance of the cell is

Moderate

A

$0.5 Ω$
B

$0.6 Ω$
C

$1.2 Ω$
D

$1.5 Ω$

Solution

$r = (\frac{l_{1} - l_{2}}{l_{2}}) \times R^{'} = (\frac{60 - 50}{50}) \times 6 = 1 .2 Ω$

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