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Q.

Four uniform wires of the same material are stretched by the same force. The dimensions of wire are as given below. The one which has the minimum elongation has:

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a

radius 3 mm, length 2 m

b

radius 2 mm, length 2 m

c

radius 0.5 mm, length 0.5 m

d

radius 3 mm, length 3 m

answer is .

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Detailed Solution

∆l = Flπr2Y       ⇒   ∆l α 1r2

Only option ‘radius 3 mm, length 2m’ is satisfying the above relation.

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