Question

why Potentiometer is better than voltmeter to calculate electrical carrying force of a cell​

Answer 1

Explanation:

the angle between the plan mirror and incident ray is 48° what is the angle of incidence and angle of reflection

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Answer 2

Answer:

Potentiometer is preferred for measurement of emf of cell. Potentiometer draws no current from cell while voltmeter draws some current, therefore emf measured by voltmeter is slightly less than actual value of emf of cell. Further the potentiometer is used with a galvanometer which is set to null reading when the experiment is performed. The method of null reading avoids many errors.

Explanation:

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