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  4. Correct diagram for the determination of internal resistance of a primary cell by potentiometer is

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Q. Correct diagram for the determination of internal resistance of a primary cell by potentiometer is

NTA AbhyasNTA Abhyas 2022

Solution:

The polarity of primary cell and secondary cell should be in same sense. Also, a key is kept in series with resistance box to measure emf when the key is open.