On heating the metal rod of length 2m fr...

On heating the metal rod of length 2m from `0°C` to `50°C`, its length is increased by 0.1 cm. the coeffecient of linear expansion of metal rod is

`2*10^-4 °C^-1`

`10^-4 °C^-1`

`1*10^-5 °C^-1`

`2*10^-5 °C^-1`

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