One end of a glass capillary tube with radius r = 0.05 cm is immersed into water to a depth of h = 2cm. What pressure is required to **** an air bubble out of the lower end of the tube : (T = 7 × 10–2 N/m and ρ= 103 kg/m3)
(A) 480 N/m2
(B) 680 N/m2
(C) 120 N/m2
(D) 820 N/m2
