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A potentiometer wire is having a length of 10m and resistance 100 Omega.It is connected in series with a cell of emf 10V and an unknown external resistance R .A cell of emf 2V is balanced against a length of 4m of the potentiometer wire.The value of unknown resistance R is

Answer» A potentiometer wire is having a length of 10m and resistance 100 Omega.It is connected in series with a cell of emf 10V and an unknown external resistance R .A cell of emf 2V is balanced against a length of 4m of the potentiometer wire.The value of unknown resistance R is


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