A bimetallic strip made up of copper and brass as shown below. Which among the following statements is/true about the bimetallic strip? (Expansion of brass is more than expansion copper?

Options

A. If this bimetallic strip is heated, brass takes outer edge of the bend and copper takes the inner edge of the bend
B. If this bimetallic strip is cooled, brass takes inner edge of the bend and copper takes the outer edge of the bend.
C. Heating and cooling do not affect the bimetallic strip.
D. Both (a) and (b)

Answer

D

Explanation

When the given bimetallic strip is heated, due to more expansion of brass than copper brass takes outer edge of the bend and copper takes inner edge. If it is cooled, due to more contraction of brass than copper, copper takes the outer edge of the bend and brass takes the inner edge.