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A steel wire 10 m long and 10^-5m^2 in c...

A steel wire 10 m long and `10^-5m^2` in crosssectional area elongates by 0.01 m under a tension of 2500 N. Young's modulus for steel from this data is computed as

A

`2.5 times 10^7 Nm^-2`

B

`2.5 times 10^9 Nm^-2`

C

`2.5 times 10^11 Nm^-2`

D

none of these

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