Potentiometer measures EMF accurately because:

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Potentiometer uses null method: at balance, no current flows through cell, so measured voltage equals true EMF (no internal resistance drop). Memory aid: 'Null method ⇒ zero current ⇒ accurate EMF measurement'. Experimental physics concept frequently tested in competitive exams to verify understanding of precision measurement techniques.

Potentiometer measures EMF accurately because: MCQ with Answer and Explanation

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