# Lenz Law and Magnetic fields in an Inductor

Hoping somebody can set me straight on the magnetic fields involved in an inductor when the current is changing. This is how I see it:

The source current has a magnetic field. This changing flux produces an EMF which in turn produces a current which also has a magnetic field which opposes the change which produced it. The lenze induced magnetic field would have opposite polarity to the inducing magnetic field.

So therefore there are two magnetic fields:

1. Magnetic field from source current
2. Magnetic field as a result of Lenz Law (cemf).
• From the Ampere's law, we know that the current in the conductor product the Magnetic field. And this change in the Magnetic field "induced voltage" in the inductor (Faraday's law). And this voltage, by definition (Lenz Law), opposes any external effort to change the existing flux (or current) in an inductor.electronics.stackexchange.com/questions/288380/…
– G36
Commented Jul 6, 2018 at 13:30
• It's the back emf (due to a changing current) that opposes a change in the current. Commented Jul 6, 2018 at 15:54