JEE Main 2026 Physics question
A liquid of density 600 kg/m³ flowing steadily in a tube of varying cross-section. The cross-section at a point A is 1.0 cm² and that at B is 20 mm². Both the points A and B are in same horizontal plane, the speed of the liquid at A is 10 cm/s. The difference in pressures at A and B points is Pa.
Answer: (D)
Solution
=100 mm² and =20 mm², so by continuity =10×100/20=50 cm/s. Bernoulli: ΔP=½ρ²−²)=½(600)(0.25−0.01)=72 Pa.