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A battery of e.m.f 3.0V is connected across a potentiometer wire AB of 10m.If the jockey J makes contact at the 30cm mark, determine the resistance of length AJ and voltage across AJ
Dear studentE = 3.0V;R / l =10Ω per ml = 30cm = 0.3m;R =10Ω per m × 0.3m = 3ΩThus , Resistance of AJ = 3 ohmsE / V = l1/ l2⟹3 / V = 1 / 0.3=3×0.3Hence , Voltage across AJ = 0.9VThanks
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