Question

Calculate the conduction current density when the resistivity of a material with an electric field of 5 units is 4.5 units.

(a) 22.5

(b) 4.5/5

(c) 5/4.5

(d) 9.5

I got this question by my college director while I was bunking the class.

Enquiry is from Loss Tangent in section Maxwell Equations of Electromagnetic Theory

Answer 1

Correct choice is (c) 5/4.5

For explanation I would say: The conduction current density is the product of the conductivity and the electric field. The resistivity is the reciprocal of the conductivity. Thus the required formula is Jc = σ E = E/ρ = 5/4.5 units.