For stationary magnet and moving wire in a circuit, electric force F makes electric current, and force varies directly with magnetic-flux (phi, depending on magnetic field B and surface area A) change over time {Faraday law of induction} {Faraday's law of induction}: F ~ d(phi)/dt, and phi = sum over A of B. Induced electric current makes magnetic field opposed to stationary magnetic field. For moving magnet and stationary wire, electric field E makes electric current in wire, and electromotive force on charges varies directly with magnetic-flux change over time. Faraday law of induction applies to both Maxwell-Faraday equation, for changing magnetic field and stationary charge, and Lorentz force law, for stationary magnet and moving wire in a circuit.
Physical Sciences>Physics>Electromagnetism>Force
5-Physics-Electromagnetism-Force
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Date Modified: 2022.0224