What does magnetic field is made up of?

[Zheng_]

Homework Statement

A magnetic field is made up of

A) positive and negative charges.

B) magnetic domains.

C) flux lines.

D) magnetic poles.

Homework Equations

The Attempt at a Solution

 

[gneill]

Hi Zheng. You need to make an attempt to solve the problem or at least discuss your reasoning for each possible choice of answer. You won't find anyone to just give you the answer; We can help, but not do your homework for you.