If we were to characterize how good a material is as an insulator by its resistance...
If we were to characterize how good a material is as an
insulator by its resistance to dissipating charge, which
of the following two materials is the better insulator?
- Dry Soil: ?r = 2.5, σ = 10−4 (S/m)
- FreshWater: ?r = 80, σ = 10−3 (S/m)
electromagnetic
Homework Answers
The charge relaxation time constant for dry soil is 
and charge relaxation time constant for fresh water
is 
From the above two statements we find charge dissipates faster in dry soil than fresh water and hence fresh water is better insulator than dry soil.
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