Twelve > Electrical Circuits
A potentiometer wire of length 10 m and resistance 30 $\rm \Omega$ is connected in series with a battery of emf 2.5 V with internal resistance 5 $\rm \Omega$ and an external resistance R. If the fall of potential along the potentiometer wire is 50 mV/m, the value of R is (in $\rm \Omega$)
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