The valve V in the bent tube is initially kept closed. Two soap bubbles A (smaller) and B (larger) are formed at the two open ends of the tube. V is now opened, and air can flow freely between the bubbles.
(a) There will be no change in the sizes of the bubbles.
(b) The bubbles will become of equal size.
(c) A will become smaller and B will become larger.
(d) The sizes of the two bubbles will become interchanged.
