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In which of the following conditions does the wettlng of surface usually occur
  • a)
    Adhesion < cohesion
  • b)
    Adhesion > cohesion
  • c)
    Adheslon = cohesion
  • d)
    Adhesive force = √(cohesive force)
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
In which of the following conditions does the wettlng of surface usual...
B) Cohesion
c) Surface tension
d) None of the above

Answer: a) Adhesion
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Community Answer
In which of the following conditions does the wettlng of surface usual...
When the adhesion force is more than the cohesion force then the fluid will wet the surface and the angle of contact between the fluid and the surface will be less than 90° (acute).

Graphically Capillarity can be represented as:
Case – 1:

when contact angle θ is acute i.e. θ < 90° 

In case of wetting fluid, the level in the capillary tube will rise and the phenomenon is capillary rise. For water and clean glass tube θ = 0°.
Case – 2:
when contact angle θ is obtuse i.e. θ > 90°

In case of non – wetting fluid, the level in capillary tube will fall and the phenomenon is capillary fall. For mercury glass tube θ = 128°. 
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In which of the following conditions does the wettlng of surface usually occura)Adhesion < cohesionb)Adhesion > cohesionc)Adheslon = cohesiond)Adhesive force = √(cohesive force)Correct answer is option 'B'. Can you explain this answer?
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