A potentiometer wire of length 100 cm ha...

A potentiometer wire of length 100 cm has a resistance of `10Omega`. It is connected in series with a resistance and an accumulator of emf 2V and negligible internal resistance. A source of emf 10 mV is balanced against a length of 40 cm of the potentiometer wire. what is the value of the external resistance?

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The correct Answer is:

`790Omega`

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