39. What is the relationship between resistivity and conductivity?
(A) Resistivity is proportional to conductivity,
(B) Resistivity is inversely proportional
to conductivity,
(C) The summation of resistivity and conductivity is a constant,
(D)
Resistivity is proportional to the square of conductivity,
(E) The relationship between
resistivity and conductivity depends on the types of materials.
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