Answer to Question #59427 in Electric Circuits for emmanuel

Question #59427
A potentiometer wire of length 100cm has a resistance of 10. It is connected in series to to a resistance R and a cell of emf 2V and negligible internal resistance. A source of emf of 10mV is balanced by a length of 40cm of the potentiometer wire. What is the value of the resistance R?
200
950
2000
790
0
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