1.

The work done to stretch a wire through `1xx10^(-3)m` is 2J. Then the work done to stretch another wire of same material having half length and double the area of the cross section by `1xx10^(-3)m` is,A. `1//4` JB. 4 JC. 8 JD. 16 J

Answer» Correct Answer - C
`(W_(2))/(W_(1))=(F_(2)l_(2))/(F_(1)l_(1))=(2xx2)/(1xx1)`
`therefore W_(2)=W_(1) xx 4=4xx2=8J`.


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