Gravitation Question 221

Question: Two exactly similar wires of steel and copper are stretched by equal forces. If the difference in their elongations is 0.5 cm, the elongation ([l] ) of each wireis[Ys(steel)=2.0×1011N/m2] [Yc(copper)=1.2×1011N/m2]

Options:

A) [ls=0.75,cm,,lc=1.25,cm]

B)[ls=1.25,cm,,lc=0.75,cm]

C)[ls=0.25,cm,,lc=0.75,cm]

D)[ls=0.75,cm,,lc=0.25,cm]

Show Answer

Answer:

Correct Answer: A

Solution:

  • [l1YYsYc=lclslcls=2×10111.2×1011=53] (i) Also [lcls=0.5]

    (ii) On solving (i) and (ii), we get [lc=0.5] cm and [ls=0.75] cm



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