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[" 141.A piece of wire of resistance "4O...

[" 141.A piece of wire of resistance "4Omega" is bent through "180^(@)" at "],[" its mid-point and the two halves are twisted together,then "],[" the resistance is "],[[" (a) "8Omega," (b) "1Omega],[" (c) "2Omega," (d) "5Omega]]

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