Question

32.2 induced magnetic fields
when will a magnetic field be created?
○ when there is either a changing electric field, an electric current or both.
○ only when an electric current is present and there is no electric field.
○ only when an electric field is present and there is no current.
○ only when both a changing electric field and an electric current are present.

Explanation:

According to Maxwell's equations, a magnetic field can be created by an electric current (Ampère's law) or a changing electric field (Maxwell's addition to Ampère's law). So it can be due to either a changing electric field, an electric current, or both.

Answer:

When there is either a changing electric field, an electric current or both.