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The Young's modulus of a material having...

The Young's modulus of a material having a cross-sectional area of `1cm^(2)` is `2 xx 10^(12)"dyne/cm"^(2)`. If the length is to be doubled the force required is

A

`4xx10^(7)N`

B

`2xx10^(7)N`

C

`10^(7)N`

D

Zero

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