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Answer to Question #35835 in Electric Circuits for moses

Question #35835
A potentiometer wire of length 100cm has a resistance of 10Ω. 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? a. 200Ω b. 950Ω c. 2000Ω d. 790Ω
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