Assertion :Potentiometer is used only to compare potential differences. Reason: The potentiometer draws current from the voltage source being measured.
A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution
The correct option is C Assertion is correct but Reason is incorrect Potentiometer is a device used to compare potential difference. Since the method involves a condition of no current flow, the device can be used to measure potential difference, internal resistance of a cell and compare emf's of two sources. Potentiometer draws no current from the voltage source being measured.