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A long wire is stretched by 0.2 cm and energy density is 0.25 J m^(-3), what will be the energy density when stretched by 1 cm ? |
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Answer» `1/100Jm^(-3)` `Uprop("extension")^(2)` `U_(1)=0.25Jm^(-3)` `l_(1)=0.2cm,l_(2)=1cm` `(U_(2))/(U_(2))=((l_(2)^(2))/(l_(2)^(1)))=1/((0.2)^(2))=100/4=25` `U_(2)=254U_(1)=25xx0.25=25/4` Correct choice is (d). |
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