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[" 19.A wire of length "L" and radius "r...

[" 19.A wire of length "L" and radius "r" is fixed at one end.When a "],[" stretching force "F" is applied on the free end,the extension "],[" in the wire is "l" .Another wire of length "2L" and radius "2r" and "],[" of the al is also fixed at one end.If a stretching force "2F" is "],[" applied on the other end,then the elongation in the length "],[" of the wire will be "],[[" (X) "1/2," (2) "l],[" (3) "2l," (4) "4l]]

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