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A uniform iron wire of cross-section are...

A uniform iron wire of cross-section area 0.20 `xx` `10^-6` `m^2` is held fixed in between fixed supports. If wire cooled from `100°C` to `O°C`, then force of 48 N is exerted on supports by ends, then expansion coefficient of wire (Young's modulus = 2 `xx` 10^11 N/`m^2`)

A

0.6 `xx` `10^-5`/°C

B

0.3 `xx` `10^-5`/°C

C

1.2 `xx` `10^-5`/°C

D

2.4 `xx` `10^-5`/°C

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