A potentiometer consisting of a wire of length Lo has a source of emf, & connected across it. When a standard cell with emf V = 6V, in series with avoltmeter, is connected at one end of the wire and at a distance L = 4 cm along the wire the voltmeter circuit is in balance and the voltmeter readszero. When the standard cell is replaced by a source of unknown emf the new balance length is found to be 6 cm.EWhat is the unknown emf?V

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