Which of the three substances has the greatest permeability?
a. gravel
b. sand
c. silt
d. all are equal?

Gravel has the greatest permeability in above options. Permeability depends upon size of particles and degree of saturation. Permeability is the measure of the capacity of a body to promote the development of a magnetic field in itself also it is called as a distributed inductance in Transmission Line Theory. Therefore, it is the level of magnetization that a body gets in answer to an applied magnetic field.

A.Gravel

is the correct answer, that was on the mini quiz

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