Two large holes are cut in a metal sheet. If this is heated, will their diameters increase or decrease?

Options

A. Both `d_1` and `d_2` will decrease
B. Both `d_1` and `d_2` will increase
C. `d_1` will increase, `d_2` will decrease
D. `d_1` will decrease, `d_2` will increase

Answer

B

Explanation

If the sheet is heated then both `d_1` and `d_2` will increase since the thermal expansion of isotropic solid is similar to true photographic enlargement.