A potentiometer wire of length 10 m and a resistance 30 ? is connected in series with a battery of emf 2.5 V and internal resistance 5 ? and an external resistance R. If the fall of potential along the potentiometer wire is 50 ?V/mm, the value of R is
Added by Cooper C.
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Given: 50 µV/mm = 50 x 10^-6 V / 10^-3 m = 5 x 10^-2 V / m Show more…
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