* Electromagnetism: Current flow is induced by a changing magnetic field. A stationary magnet creates a magnetic field, but waving a coil of wire in the air doesn't change the Earth's magnetic field significantly.
* Faraday's Law: This fundamental law of electromagnetism states that the electromotive force (EMF), which drives current, is proportional to the rate of change of magnetic flux through a loop. Since there's no significant change in magnetic flux, there's no EMF, and therefore no current.
What *could* induce current:
* Moving the coil near a magnet: Waving the coil near a magnet would cause the magnetic flux through the coil to change, inducing current.
* Changing the magnetic field: If you could rapidly change the magnetic field around the coil (like using an electromagnet with a changing current), you would induce current.
* Rotating the coil in a magnetic field: This is the principle behind generators. Rotating the coil in a magnetic field changes the magnetic flux, inducing current.
Let me know if you have any other questions about electromagnetism!
