Q.

Two wires of same length and material but with radii 0.1mm and 0.2mm are loaded with the same weight. Then

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a

Thick wire extends more

b

Thin wire extends more

c

Both undergo same extension

d

None

answer is B.

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Detailed Solution

Y=FlAe⇒Y=Flπr2e⇒e∝1r2    Thin wire elongates more
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Two wires of same length and material but with radii 0.1mm and 0.2mm are loaded with the same weight. Then