TS EAMCET 20-July-2022 Shift 2 Solved Paper

A circular copper ring at 30∘C has a hole with an area of 9.98cm2. It is made to slip onto a steel rod of cross-sectional area of 10cm2, by raising the temperature of both ring and rod simultaneously by an amount ∆T. If the coefficient of linear expansion of copper and steel are 17×10−6∕‌∘C and 11×10−6∕‌∘C, then minimum value of ∆T should be