First slide

potentiometer

Question

A cell can be balanced against 110 cm and 100 cm of potentiometer wire, respectively with and without being short circuited through a resistance of 10 ohm. Its internal resistance is

Moderate

Solution

$\begin{array}{l} Internal resistance r = \frac{R (l_{1} - l_{2})}{l_{2}} \\ r = \frac{10 (110 - 100)}{100} \\ r = 1 Ω \end{array}$

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