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Q.

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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a

0.005m

b

0.01m

c

0.02m

d

0.04m

answer is A.

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Detailed Solution

e∝ℓr2 ⇒e1e2=l1l2r2r12⇒0.01e2=l12l12r1r12⇒0.01e2=2⇒e2=0.012=0.005
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