A circular metallic disc has a circular hole at its centre When the disc is heated the diameter of t...........

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A circular metallic disc has a circular hole at its centre. When the disc is heated, the diameter of the hole

decreases

increases

decreases at first and the increases

remains unchanged

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Explanation:

When a metal is heated to increase its temperature, it undergoes expansion.
When heated, the size of the materials having positive thermal expansion coefficient increases.
In the present example, the disc of copper is heated to increase its temperature.
The copper has a positive thermal expansion coefficient. Hence, the size of the hole in the copper disc will increase.

By: Abhipedia

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abhimanu admin

When a metal is heated to increase its temperature, it undergoes expansion. When heated, the size of the materials having positive thermal expansion coefficient increases. In the present example, the disc of copper is heated to increase its temperature. The copper has a positive thermal expansion coefficient. Hence, the size of the hole in the copper disc will increase.

Bhavna Rathee