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Draw a labelled circuit diagram of a pot...

Draw a labelled circuit diagram of a potentiometer to compare emfs of two cells. Write the working formula (Derivation not required).

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The circuit diagram of a potentiometer to measure the internal resistance .r. of a cell is given below. The working formula is`r= R ((l_(1))/(l_(2))- 1) l_(1)` is the distance of null point from point A and `l_(2)` is the distance of null point from A after taking out a suitable resistance R from the resistance box.
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