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[" 12.A potentiometer wire has length "4...

[" 12.A potentiometer wire has length "4m" and "],[" resistance "8Omega" .The resistance that must be "],[" connected in series with the wire and an "],[" accumulator of em."f.2V" ,so as to get a potential "],[" gradient "1mV" per "cm" on the wire is "],[[" (a) "44Omega," (b) "48Omega," (c) "32Omega," (d) "40Omega],[" (20) "5" Camcelled "]]

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