What really causes electromagnetic induction/ the motor effect?

henpen
Messages
50
Reaction score
0
When a conducting wire is subjected to a changing magnetic field, what causes the electrons in this wire to move?
Conversely, why does the movement of current in the wire (with a non-'moving' magnetic field) cause the wire to move?
I understand these phenomena macroscopically (and that they are different sides of the same electromagnetic coin), but at the most fundamental level, what happens?
 
Physics news on Phys.org
I believe the idea is a called a "Hole Charge."

I don't know exact chemistry of conductors, but basically, they are usually fairly stable.

Electricity is more of a pulling effect.

When you pull one of the electrons from one end of the wire, those atoms pull electrons from neighboring atoms and the "effort" travels up the wire. The "effort" is near the speed of light. The electrons themselves do not travel at the speed of light. In fact, the more they have to travel, the more heat it causes and resistance builds up.

Thus A/C is more efficient then D/C.

The more stable the metal, the better conductor is it makes. For example: Gold is one of the best conductors and does not oxidize like many others. At least, I think so.
 
Fundamentally, a charge experiences the Lorentz force, period. The E and B fields at the charge determine that force.

Note that a changing magnetic field creates an electric field. That's one of the fields that exerts a force on the charge in the case of a time-changing magnetic field.

Every one of Lord Challen's observations is incorrect.
 
Last edited:
Insights auto threads is broken atm, so I'm manually creating these for new Insight articles. Towards the end of the first lecture for the Qiskit Global Summer School 2025, Foundations of Quantum Mechanics, Olivia Lanes (Global Lead, Content and Education IBM) stated... Source: https://www.physicsforums.com/insights/quantum-entanglement-is-a-kinematic-fact-not-a-dynamical-effect/ by @RUTA
If we release an electron around a positively charged sphere, the initial state of electron is a linear combination of Hydrogen-like states. According to quantum mechanics, evolution of time would not change this initial state because the potential is time independent. However, classically we expect the electron to collide with the sphere. So, it seems that the quantum and classics predict different behaviours!
Back
Top