A time-varying electric field produces a time-varying magnetic field.

Name: A time-varying electric field produces a time-varying magnetic field.
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This is a principle of electromagnetism described by Maxwell's equations, specifically Faraday's law of electromagnetic induction, which states that a time-varying magnetic field induces an electromotive force and hence an electric field, and Maxwell's addition to Ampère's law, which shows that a time-varying electric field produces a magnetic field.

A Time-Varying Electric Field Produces a Time-Varying Magnetic Field