I know that there is some relationship between electric current and magnetism, but I am having troub

adocidasiaqxm

adocidasiaqxm

Answered question

2022-05-19

I know that there is some relationship between electric current and magnetism, but I am having trouble pinning down the exact relationship. Is electric current a necessary condition for the existence of magnetic field? And is electric current a sufficient condition for the existence of magnetic field?
In other words, is it true that "there is electric current if and only if there is a magnetic field"?

Answer & Explanation

Lucille Lucas

Lucille Lucas

Beginner2022-05-20Added 16 answers

No!
A changing electric field can also create a magnetic field. An example of this is Electromagnetic field. Recall that
× B = μ 0 ϵ 0 E t
in absence of current density.

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