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AB is a potentiometer wire of length 100 cm and its resistance is 10 Ω. It is connected in series with a resistance R=40 Ω and a battery of emf 2 V and negligible internal resistance. If a source of unknown emf E is balanced by 40 cm length of the potentiometer wire, then the value of E is

Answer» AB is a potentiometer wire of length 100 cm and its resistance is 10 Ω. It is connected in series with a resistance R=40 Ω and a battery of emf 2 V and negligible internal resistance. If a source of unknown emf E is balanced by 40 cm length of the potentiometer wire, then the value of E is






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