A bar magnet or other source of magnetic field induces a current in a coil of wire when the magnetic flux through the coil changes.
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An electric current in one conductor can induce a current in a separate conductor. The inducing current must...
An image current is created in a ferromagnetic material in the presence of a real current.
The demonstration is a realization of problem 5.17 in J.D. Jackson's Classical Electrodynamics, 3rd ed, (John Wiley & Sons, 1999) p.229. To paraphrase...
A magnet tethered over a spinning aluminum disc levitates due to induced currents in the disc.
As the disc spins, electrical currents are induced in the aluminum as it moves with respect to the magnet. These induced currents...
Oersted showed that an electric current produces a magnetic field. His experiment is repeated here on a suitable grand scale.
The current carrying wire in this case is a tubular 22mm diameter copper pipe of dimensions shown in fi...
The magnetic field lines of the Earth can be represented by the field lines of a bar magnet.
The Earth's magnetic field is basically a magnetic dipole. It can therefore be represented to first approximation by the field of a...
OHP representation of lines of force using bar magnet and iron filings.
The magnetic field lines of the Earth can be represented by the field lines of a bar magnet.
The Earth's magnetic field is basically a magnetic dipole...
When a magnetic field is applied perpendicular to a conductor carrying current, a potential difference is observed between points on opposite sides of the conductor. This happens because the magnetic field deflects the moving electrons...
A superconducting material in the presence of an external magnetic field excludes that field from its interior. This is shown by levitating a magnet above a high-temperature superconductor.
Photo courtesy Clive Grainger
We have a...
An empty aluminum soft drink can, placed inside a coil of wire, is made to implode when a capacitor is discharged through the coil.
A dramatic demonstration of Faraday induction and of the repulsion of oppositely directed electric currents...
