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The length of potentiometer wire is 1 m and its resistance is 40 A current...

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The length of potentiometer wire is 1 m and its resistance is 40 A current of 5 mA is flowing in it An unknown source of emf is balanced on 40 cm length of this wire The emf of the source is 05mV 06 mV O 12 mV 08 mV

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