In the figure, the cross-sectional area of the smaller tube is a and that of the larger tube is 2a. A block of mass m is kept in the smaller tube having the same base area a, as that of the tube. The difference between water levels of the two tubes is
![](https://sahay.guru/wp-content/uploads/2020/09/05-1024x231.jpg)
![](https://sahay.guru/wp-content/uploads/2020/09/05-1-1024x285.jpg)