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The balance length of a potentiometer wire connected to a cell of an unknown e.m.f. is 90.0cm.when the cell is replaced by a Daniel cell of e.m.f. 1.08V the balance point is 64.8cm. Determine the value of the unknown e.m.f.
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Unknown e.m.f. = (1.08V x 90.0cm) / 64.8cm = 1.44V
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