Surface Tension – Excess Pressure in a Soap Bubble

2019 1 question

1. A soap bubble, having radius of 1 mm, is blown from a detergent solution having a surface tension of $2.5\times10^{-2}\ N/m$. The pressure inside the bubble equals at a point $Z_0$ below the free surface of water in a container. Taking $g=10\ m/s^2$, density of water $=10^3\ kg/m^3$, the value of $Z_0$ is: