Question

What is the expression for force in a current carrying conductor?

(a) F=K/r^2

(b) F=Kq/r^2

(c) F=Kq1q2/r^2

(d) F=Kq1q2/r

I had been asked this question during an interview for a job.

The question is from Force on a Current Carrying Conductor topic in section Electromagnetism of Basic Electrical Engineering

Answer 1

Right option is (c) F=Kq1q2/r^2

The best explanation: The force in a current carrying conductor is directly proportional to the product of the two charges and inversely proportional to the square of the distance between them. Hence F=Kq1q2/r^2, where K is the constant of proportionality.