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Two wires A and B are made of same mater...

Two wires A and B are made of same material. The wire A has a length l and diameter r while the wire B has a length 2l and diameter r/2. If the two wires are stretched by the same force the elongation in A divided by the elongation in B is

A

`2:3`

B

`3:4`

C

`3:2`

D

`6:1`

Text Solution

Verified by Experts

The correct Answer is:
C
(c) Energy stored, `U=(1)/(2)xx(Yal^(2))/(L)`
`=(1)/(2)xx(2xx10^(11)xx3xx10^(-6)xx(1-10^(-3))^(2))/(4)`
0.075 Joule
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