A potentiometer wire of length 1000 cm has a resistance of 10 `Omega` It is connected in series with a resistance and fa cell of emf 2 V and of neglig
A potentiometer wire of length 1000 cm has a resistance of 10 `Omega` It is connected in series with a resistance and fa cell of emf 2 V and of negligliable internal resistance. A sourece of emf 10 mV is balanced against 40 cm of the potentiometer wire. What is the value of the external resistance?
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