Answer :
Final answer:
B) decrease. When the radius of a capillary tube is increased, the level of liquid in the tube will decrease.
Explanation:
The level of liquid in a capillary tube is determined by the balance between cohesive and adhesive forces. When the radius of the capillary tube is increased, the cohesive forces within the liquid become comparatively weaker, causing the liquid level in the tube to decrease. This is due to the reduced capillary rise, which is the height to which a liquid can be drawn up in a narrow tube.
For example, when water is poured into a wide glass tube, the liquid level will remain higher than in a narrower tube of the same height. Similarly, when the radius of the capillary tube is decreased, the liquid level will increase due to enhanced capillary rise.
Therefore, in this case, when the radius of a capillary tube is increased, the level of liquid in the tube will decrease (option B).
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