Question

Magnetic field can be produced by ___________

(a) Conduction current

(b) Displacement current

(c) Both conduction and displacement current

(d) It is produced naturally

This question was posed to me by my school principal while I was bunking the class.

This intriguing question originated from Maxwell’s Equations in portion Electrodynamics of Engineering Physics II

Answer 1

Correct choice is (c) Both conduction and displacement current

Easiest explanation: Earlier it was believed it was believed that only the conduction current could produce magnetic field. Later, Maxwell showed that displacement current can also produce magnetic field. It was known as Maxwell-Ampere law.