If the temperature of a wire of length 2...

If the temperature of a wire of length `2 m` and area of cross-section `1 cm^2` is increased from `0^(@)`C to `80^(@)`C and is not allowed to increase in length, then force required for it is `(Y= 10^10 N//m^2, prop=10^-6//^(@)C)`

`80 N`

`160 N`

`400 N`

`120 N`

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