# Non-electrostatic electric fields

So, I know that changing magnetic field produces a non electrostatic electric field which goes around in circles. My question is how do we know they are circular in nature? If I'll put a square wire in changing magnetic field then the current must go in a square and so should the electric field. Isn't it right?

• > "which goes around in circles" -- that is true only in a very special situation, where the magnetic field has cylindrical symmetry. In most cases, the magnetic and thus also the electric field is more complicated. – Ján Lalinský Oct 21 '18 at 23:22