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Figure shows a 2.0V potentiometer used ...

Figure shows a 2.0V potentiometer used for the determination of internal resistance of a 1.5V cell , When the key is not inserted in the plug , the balance point is at 60 cm and in the closed circuit the balance point is at 50 cm. Find the internal resistance of the cell .

Text Solution

Verified by Experts

`(E_(2))/(E_(1)) = (l_(2))/(l_(1))`
or `E_(2) = (l_(2))/(l_(1)) E_(1) =(50)/(30) xx 1.5V = 2.5V`
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