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Q.

A wire is stretched 1 mm by a force of 1 kN How far would a wire of the same material and length but of four times that diameter be stretched by the same force?

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a

12mm

b

14mm

c

18mm

d

116mm

answer is D.

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Detailed Solution

Y=FlaΔlY, I and F are constants.∴ Δl∝1D2Δl2Δl1=D12D22=116∴ Δl2=116mm
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