AP EAPCET 19-Aug-2021 Shift 1 Paper

The lower end of a capillary tube is dipped into water and it is observed that the water in capillary tube rises by 7.5‌cm. Find the radius of the capillary tube used, if surface tension of water is 7.5×10−2Nm−1 ? Angle of contact betweenwater and glass is 0° and acceleration due to gravity is 10ms−2