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Question
A Daniel cell is balanced on 125 cm lengths of a potentiometer wire. Now the cell is short circuited by a resistance 2 Ω and the balance is obtained at 100 cm. The internal resistance of the Daniel cell is ______.
Options
0.5 Ω
1.5 Ω
1.25 Ω
4/5 Ω
MCQ
Fill in the Blanks
Solution
A Daniel cell is balanced on 125 cm lengths of a potentiometer wire. Now the cell is short circuited by a resistance 2 Ω and the balance is obtained at 100 cm. The internal resistance of the Daniel cell is 0.5 Ω.
Explanation:
r = `("l"_1/"l"_2-1)`R
= `(125/100-1)2`
= 0.25 × 2
= 0.5 Ω
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