Unstable equilibrium.
Answer:-
A body is said to be in unstable equilibrium if after slightly displacing it, the forces acting are such that the body tends to go still farther from original equilibrium position.
angle of contact.
It is defined as the angle between the tangent to the liquid surface at the point of contact and solid surface inside the liquid is called as angle of contact The value of angle of contact depends upon (i) Nature of solid and liquid in contact (ii) Cleanliness of the surface in contact (iii) Medium above the free surface of liquid
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