Question

The figure shows a 2.0 V potentiometer used for the determination of internal resistance of a 1.5 V cell. The balance point of the cell in open circuit is 76.3 cm. When a resistor of 9.5 is used in the external circuit of the cell, the balance point shifts to 64.8 cm length of the potentiometer. The internal resistance of the cell is

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A

1.63

B

1.66

C

1.69

D

1.72

Hard

Solution

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Correct option is C)

The expression of internal resistance of  a cell in potentiometer is given by

or

Solve any question of Current Electricity with:-

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