AP EAMCET · PHYSICS · Current Electricity
In the determination of the internal resistance of a cell with a potentiometer, the error in the measurement of the balancing length is \(\pm 1 \mathrm{~mm}\). When the cell alone is connected in the circuit, the balancing length is obtained at \(60 \mathrm{~cm}\) and when the cell is shunted with a resistance of \(10 \Omega \pm 2 \%\), the balancing length is obtained at \(50 \mathrm{~cm}\). The error in the determination of the internal resistance of the cell is
- A \(2.4 \%\)
- B \(4.2 \%\)
- C \(1.8 \%\)
- D \(5.6 \%\)
Answer & Solution
Correct Answer
(B) \(4.2 \%\)
Step-by-step Solution
Detailed explanation
\(\quad r=R\left(\frac{l_1}{l_2}-1\right)\) This is value of internal resistance here.…
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