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[" 47.A potentiometer wire "10m" long,ha...

[" 47.A potentiometer wire "10m" long,has "],[" a resistance of "40Omega" .It is connected "],[" in series with a resistance box and a "],[2" V storage cell.If the potential gradient "],[" along the wire is "0.1mV/cm" ,the "],[" resistance unplugged in the box is "],[[" A) "260Omega," B) "760Omega],[" C) "960Omega," D) "1060Omega]]

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