question_answer

The diameters of steel rods A and B having the same length are 2 cm and 4 cm respectively. They are heated through \[\mathbf{100}{}^\circ \text{ }\mathbf{C}\]. What is the ratio of increase of length of A to that of B?

Answer:

                \[\text{1}:\text{1}\].This is because the increase in length does not depend on the diameter of the steel rod.