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Two wires of same material and same diam...

Two wires of same material and same diameter have lengths in the ratio 2 : 5. They are stretched by same force. Calculate the ratio of workdone in stretching them.

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Work done `W = 1/2 F(Delta l) = 1/2 F ((Fl)/(pi r^2 Y))`
Since F, Y and r are the same for both the wires, we have `(W_1)/(W_2) = (l_1)/(l_2) = 2/5`
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