Question

The repulsive force between the soil colloids become effective when?

(a) They approach other

(b) They combine with each other

(c) They are at a distance

(d) They overlap

The question was asked by my college professor while I was bunking the class.

My question comes from Interparticle Force in a Soil Mass topic in section Soil Structure and Clay Minerology of Geotechnical Engineering I

Answer 1

Correct answer is (a) They approach other

The explanation is: When two soil colloids approach each other close enough, the double layer tend to overlap and interact.