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Questions  

A wire is stretched by 0.01m by a certain force 'F' another wire of same material whose diameter and lengths are double to original wire is stretched by the same force then its elongation will be ....

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By Expert Faculty of Sri Chaitanya
a
0.005m
b
0.01m
c
0.02m
d
0.04m

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detailed solution

Correct option is A

e1 = 0.01m = 10-2 m F1 = F2 = F
Let r1=D2, r2=2D2=D
l1 = l    l2 = l    e2 = ?
eIr2

e2=l2l1 x r12r22 x e1=0.005 m

easy
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