First slide

potentiometer

Question

A Daniel cell is balanced on 125 cm length of a potentiometer wire. Now the cell is short-circuited by a resistance 2 ohm and the balance is obtained at 100 cm. The internal resistance of the Daniel cell is

Easy

A

0.5 ohm
B

1.5 ohm
C

1.25 ohm
D

4/5 ohm

Solution

$r = (\frac{l_{1} - l_{2}}{l_{2}}) R = (\frac{25}{100}) 2 = 0 .5 Ω$

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