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The following four wires of length L and...

The following four wires of length L and radius 'r' are made of the same material which of these will have largest extension ?

A

L = 40 cm, r = 0.02 mm

B

L = 100 cm, r = 0.5 mm

C

L = 200 cm, r = 1 mm

D

L = 300 cm, r = 1.5 mm

Text Solution

Verified by Experts

The correct Answer is:
A
`Y=(F.L)/(pi r^(2)l) or Delta prop (L)/(r^(2))`
Here `L//r^(2)` is maximum when L = 40 cm and r = 0.20 mm as compared to other.
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