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Electric Potential and Potential Difference

Potentiometer...

Question

Potentiometer is a better instrument for measuring EMF as compared to voltmeter because

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A

It is cheap

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B

It draws maximum current from the cell

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C

It is sturdy

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D

It is based on null deflection method

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Solution

The correct option is D It is based on null deflection method

A potentiometer draws no current from the battery or main circuit at the balance point, and thus it’s a better and more accurate instrument than a voltmeter.

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Q. Assertion : Voltmeter is much better than a potentiometer for measuring emf of cell.
Reason : A potentiometer draws no current while measuring emf of a cell.

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Q. In the question given below, a statement of Assertion (A) is given followed by a corresponding statement of Reason (R) just below it. Of the statements mark the correct answer.

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Reason (R): A potentiometer draws no current while measuring emf of a cell.

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