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Physics-Thermal Expansion

NEET Physics Thermal Expansion MCQ Question

Type: MCQ-numerical-Hard-Class 11

A copper rod is 2 meters long at 20°C. If the temperature increases to 100°C, what is the new length of the rod? (Given: coefficient of linear expansion for copper, α_l = 1.7 x 10^-5 K^-1).

A

00272 m

B

034 m

C

00034 m

D

017 m

Correct Answer

Option A

Detailed Explanation

The change in length Δl can be calculated using Δl = α_l * l * ΔT. Given α_l = 1.7 x 10^-5 K^-1, l = 2 m, and ΔT = 80°C, we find Δl = 0.00272 m, so the new length is 2.00272 m.

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