A wire, 20m long is heated from a temperature of 5°C ...
A wire, 20m long is heated from a temperature of 5°C to 55°C. If the change in length is 0.020m, calculate the linear expansivity of the wire
1.0 x 10-3k-1
2.0 x 10-4k-1
2.0 x 10-5k-1
1.0 x 10-5k-1
2.0 x 10-6k-1
Correct answer is C
α=ΔLLΔθ=0.02020×(55−5)=2.0×10−5
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