Question 581: Current Electricity

Question

In a potentiometer experiment, the balancing length for a cell is $$240 \mathrm{~cm}$$. On shunting the cell with a resistance of $$2 \Omega$$, the balancing length becomes half the initial balancing length. The internal resistance of the cell is

Accepted Answer

The internal resistance is given by
$$\begin{aligned}
r & =R\left(\frac{\ell_1-\ell_2}{\ell_2}ight) \
& =2\left(\frac{240-120}{120}ight)=2 	imes \frac{120}{120}=2 \Omega
\end{aligned}$$

Answer

$$1.5 \Omega$$

Answer

$$1 \Omega$$

Answer

$$0.5 \Omega$$

Answer

$$2 \Omega$$

Current Electricity

In a potentiometer experiment, the balancing length for a cell is $240 \mathrm{~cm}. On shunting the cell with a resistance of 2 \Omega$, the balancing length becomes half the initial balancing length. The internal resistance of the cell is

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