A wire, 20m long is heated from a temperature of 5oC to 55oC. If the change in length is 0.020m, calculate the linear expansivity of the wire
A
1.0 x 10-3k-1
B
2.0 x 10-4k-1
C
2.0 x 10-5k-1
D
1.0 x 10-5k-1
E
2.0 x 10-6k-1
Verified Correct Answer: C.
Physical Principles & Numerical Solution
\(\alpha = \frac{\Delta L}{L \Delta \theta} = \frac{0.020}{20 \times (55 - 5)} = 2.0 \times 10^{-5}\)
Source: Myschool Past Questions Archive (Record #33269)