Physics (AS & A Level) · May / June 2026 · Paper 13 · Question 14

A U-tube has a left arm of cross-sectional area A and a right arm of cross-sectional area 4A. The tube contains water of density 1000 kg m⁻³ and oil of density 850 kg m⁻³ as shown. The column of oil on top of the water in the left-hand arm is of length 30.0 cm. What is the difference in height x between the levels in the two arms of the tube?

1. A4.5 cm
2. B6.2 cm
3. C23.8 cm
4. D25.5 cm

As printed in the paper