AMU Engineering 2020 solved paper Solved Paper

Figure shows a simple potentiometer circuit for measuring a small emf produced by a thermocouple The meter wire PQ has a resistance of 5Ω and the driver cell has an emf of 2.00V. If a balance point is obtained at 0.600m along PQ, when measuring an emf of 6.00mV, then what is the value of resistance R ?