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28 The length of potentiometer wire is 1 m and its 28 Ha resistance is...

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28 The length of potentiometer wire is 1 m and its 28 Ha resistance is 4 22 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 ufarte 1 fa 40 cm 1 5 mV 2 6 mV 3 12 mV 4 8 mV 1 5 m 3 12 r

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