AP EAMCET · PHYSICS · Current Electricity
In a potentiometer experiment the balancing length with a cell is \(560 \mathrm{~cm}\). When an external resistance of \(10 \Omega\) is connected in parallel to the cell, then the balancing length changes by \(60 \mathrm{~cm}\). Find the internal resistance of the cell.
- A \(1 \Omega\)
- B \(2 \Omega\)
- C \(1.2 \Omega\)
- D \(2.1 \Omega\)
Answer & Solution
Correct Answer
(C) \(1.2 \Omega\)
Step-by-step Solution
Detailed explanation
Given, \(l_1=560 \mathrm{~cm}, R=10 \Omega\), \(\Rightarrow \quad \begin{aligned} & l_2=l_1-60 \\ & l_2=560-60=500 \mathrm{~cm} \end{aligned}\) \(\therefore\) Internal resistance of cell is given by…
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