Three wires are made of copper having circular cross sections. Wire 1 has a length l and radius r. Wire 2 has a length l and rad
ius 2r. Wire 3 has a length 2l and radius 3r. Which wire has the smallest resistance?
1 answer:
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Answer:
Explanation:
L = Initial length of segment = 79 m
T = Normal temperature =
l = Width to be left for expansion
= Coefficient of linear expansion of the material =
= Maximum temperature =
= Change in temperature =
The expression of linear expansion is given by
The expression for the minimum gap distance l the engineers must leave for a track rated at temperature is