Question

The magnitude of the conduction current density for a magnetic field intensity of a vector yi + zj + xk will be

(a) 1.414

(b) 1.732

(c) -1.414

(d) -1.732

I got this question in an interview for job.

The doubt is from Maxwell Law in Time Static Fields topic in portion Maxwell Equations of Electromagnetic Theory

Answer 1

Correct choice is (b) 1.732

Explanation: From the Ampere circuital law, the curl of H is the conduction current density. The curl of H = yi + zj + xk is –i – j – k. Thus conduction current density is –i – j – k. The magnitude will be √(1 + 1 + 1) = √3 = 1.732 units.