AIIMS 2018 Physics Potentiometer MCQ Question
Assertion : The e.m.f of the driver cell in the potentiometer experiment should be greater than the e.m.f of the cell to be determined.
Reason : The fall of potential across the potentiometer wire should not be less than the e.m.f of the cell to be determined.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
In a potentiometer setup, the balance point is achieved when the potential difference across the wire equals the e.m.f. of the experimental cell. If the e.m.f. of the driver cell or the potential difference across the potentiometer wire is less than the e.m.f. of the experimental cell, there will not be enough voltage to balance it, resulting in no balance point. Other options (2, 3, and 4) do not accurately reflect this relationship, as they may imply that balance points can be achieved under conditions that violate the fundamental principle of equal potential differences.
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