The principle of electro-magnetism states that electrical current flows through an electrical ____, a magnetic field will be created.

A) insulator
B) conductor
C) line of flux
D) electron

The principle of electro-magnetism, as stated by the famous scientist James Clerk Maxwell, is that a magnetic field can be created by an electrical conductor when an electrical current flows through it. Therefore, a conductor is required for the creation of a magnetic field. Insulators, on the other hand, do not allow electrical current to flow through them, and lines of flux and electrons are not directly related to the creation of a magnetic field.