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If the co-efficient of linear expansion ...

If the co-efficient of linear expansion of iron is `12 xx 10^-6 //^@C`, the value of co-efficient of superficial expansion is.

A

`12 xx 10^-6//^@C`

B

`18 xx 10^-6//^@C`

C

`36 xx 10^-6//^@C`

D

`24 xx 10^-6//^@C`

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