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, l and F are constants.Δl∝1D2⇒Δl2Δl1=D12D22=116⇒Δl2=116mm