A metal cylinder hangs vertically at rest, supported by a cord. The diagram shows the cylinder in four separate positions P, Q, R and S. Which statement accounts for the change in the tension $T$ in the cord?
- AAt P and Q, the tension $T$ in the cord is the same because the difference in pressure between the top and bottom of the cylinder is the same.
- BAt Q, the tension $T$ in the cord is less than at P because, at smaller depth, liquid pressure is smaller.
- CAt R, the tension $T$ in the cord is less than at P because atmospheric pressure is less than water pressure.
- DAt S, the tension $T$ in the cord is greater than at P because atmospheric pressure at S exerts no force on the top or bottom of the cylinder.