Questions
The resistance of a potentiometer wire of length 200cm is . This wire is connected in series with a 20 v battery and an external resistance of . What will be the balancing length of a secondary cell of emf 4 volt?
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Correct option is B
Current in the potentiometer wire is given by i=2010+30A=0.5APotential gradient =0.5 x 10200v/cm=140v/cmIf x cm be the balancing length, Then140 ×x=4⇒x=160cmSimilar Questions
A cell of resistance and emf 10 volt is connected to a uniform wire of length 500 cm and resistance 3 ohm. The potential gradient in the wire is
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