First slide

Thermal expansion

Question

A rectangular metal plate has two circular holes drilled in it in a symmetric manner as shown in the figure. If the metal plate is uniformly heated, which of the shown distances “A”, “B” or “C” increases?

Moderate

A

A, C
B

A, B and C
C

B, C
D

A, B

Solution

A hole or hollow in a solid expands on heating as if it is filled with the same metal. Fill up the holes and treat them as two circles drawn and think what happens when the plate is heated

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