A. 0.20m
B. 0.22m
C. 0.25m
D. 0.02m
Correct Answer:
Option D = 0.02m
Explanation
Safety gap = expansion of the rod
= α×L0×Δtα×L0×Δt
where αα = linear expansivity of the material
L0L0 = Initial length of the material
ΔtΔt = Change in temperature
∴∴ The safety gap = 2×10-5×20×(75−25)
= 2×10-5×20×(75−25)
= 2×10-5×103
2×10-5×103
= 2×1010-2
= 0.02 m
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