Answers

2016-01-25T17:38:11+05:30
ΔT=T-20
l=800mm
Δl=1mm
α=25x10⁻⁶°C
Δl/l=αΔT
1/800=25*10⁻⁶(T-20)
T-20=10⁶/2x10⁴
T-20=0.5x10²
T-20=50
T=70°C

Sorry, if I had given much of steps.Usually I don't give much, but many complain.
Hope it'd be useful.Please choose it the brainliest.
MASelvam IITian.

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