Question

A magnetic field is created ____________.

a. when a compass is placed next to a wire.
b. when an electric current flows through a wire.
c. when wire is wrapped around an iron core.
d. when wire is twisted into a loop.

Answer 1

b. when an electric current flows through a wire

Step-by-step explanation:

Hans Oersted discovered about two hundred years ago that when the electric current flowed through a wire a magnetic field was created.

(*) Sorry for my late answer but I hope this helps others that are looking for this.

I got 100% ;)

Answer 2

Answer: B

Step-by-step explanation:

Magnetic fields are created due to charges in motion. Current by definition is the amount of charge flowing over time. Therefore, the answer is B, when an electric current flows through a wire.