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[" 4.A wire of length "50cm" and cross "...

[" 4.A wire of length "50cm" and cross "],[" sectional area of "1" square "km" is "],[" extended by "1mm" .The required work "],[" will be "(Y=2times10^(10)Nm^(-2))],[" a) "6times10^(-2)J" b) "4times10^(-2)J],[" c) "2times10^(-2)J" d) "1times10^(-2)J]

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