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A wire of length 50 cm and cross section...

A wire of length `50 cm` and cross sectional area of 1 sq. mm is extended by `1mm`. The required work will be `(Y=2xx10^(10) Nm^(-2))`

A

`6xx10^(-2) J`

B

`4xx10^(-2) J`

C

`2xx10^(-2) J`

D

`1 xx10^(-2) J`

Text Solution

Verified by Experts

The correct Answer is:
C
(c) Required work `W=(Yal^(2))/(2L)`
`=(2xx10^(10)xx10^(-6)xx(10^(-3))^(2))/(2xx50xx10^(-2))`
`=2xx10^(-2) J`
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