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Q.

With the help of potentiometer, we can determine the value of emf of a given cell. The Sensitively of the potentiometer is
A. Directly proportional to the length of the potentiometer wire
B. Directly proportional to the potential gradient of the wire
C. inversely proportional to the potential gradient of the wire
D. inversely proportional to the length of the potentiometer wire
Choose the correct option for the above statements

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a

A and C only

b

B and D only

c

C only

d

A only

answer is A.

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Detailed Solution

detailed_solution_thumbnail

Potential gradient K=VA−VBl.

As we know, The sensitivity of potentiometer is inversely proportional to the potential gradient.

Increase in the length of the wire decrease the potential gradient of the wire thereby helps us to measure the emf more accurately.

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With the help of potentiometer, we can determine the value of emf of a given cell. The Sensitively of the potentiometer isA. Directly proportional to the length of the potentiometer wireB. Directly proportional to the potential gradient of the wireC. inversely proportional to the potential gradient of the wireD. inversely proportional to the length of the potentiometer wireChoose the correct option for the above statements