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The angle of contact (θ) determines wetting behavior: an acute angle (strong attraction to the solid) causes spreading (wetting), while an obtuse angle (weak attraction) leads to droplet formation, as explained in the surface tension section.
Ref: NCERT Class 11 Physics, Thermal Properties and Gravitation.
The angle of contact depends on the relative strength of adhesive (liquid-solid) and cohesive (liquid-liquid) forces, determining wetting behavior (acute for wetting, obtuse for non-wetting). As per NCERT, applying relevant law/formula with correct units and sign convention leads to It depends on adhesive and cohesive forces. This satisfies dimensional consistency and physical conditions given, so option B is scientifically correct.
Ref: NCERT Class 11 Physics, Thermal Properties and Gravitation.
Wetting agents reduce surface tension and increase adhesion between the liquid and solid, lowering the angle of contact (θ), as the liquid spreads more easily, enhancing wetting, as explained in the chapter.
Ref: NCERT Class 11 Physics, Thermal Properties and Gravitation.
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