Created by StemPy LabA potentiometer measures the emf of a cell more accurately than a voltmeter does, because at balance the potentiometer
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← Two cells balance on a potentiometer wire at 140 cm and 210 cm. What is the ratio of their emfs, first to second?A student cannot read the internal resistance of a cell directly. She finds its null point on a potentiometer wire at 518 cm, and then at 370 cm after placing a 5.0 Ω load across it. What is the internal resistance? →
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