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  4. Two spheres A and B are made of the same material and have the same radius. Sphere A is hollow and sphere B is solid. Both the spheres are heated to the same temperature. Which of the following is correct ?

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Q. Two spheres $A$ and $B$ are made of the same material and have the same radius. Sphere $A$ is hollow and sphere $B$ is solid. Both the spheres are heated to the same temperature. Which of the following is correct ?

Thermal Properties of Matter

Solution:

A cavity in a material expands in exactly the same way as if the cavity were filled with material. Thus, both spheres will expand by the same amount.