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 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...
A neutral conductor (or dielectric) experiences a torque, but no net force, when placed in a uniform electric field. It does experience a net force in a non-uniform field.
When an electrically neutral object is suspended in a uniform electric...
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...
Homemade chemistry-lab style battery in a beaker.
This is actually just show and tell, lead plate and lead/lead oxide plate in a battery jar.
Use a gel cell battery to show electrical current at an integer multiple of the cell voltage between lead and lead...
Insulating glass becomes a conductor of electricity when heated red-hot with a blowtorch. (m) (T+)
At room temerature, glass is almost as good an insulator as hard rubber. When heated to 1000 K, however, glass has a resistivity of less than 10...
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...
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...
The growth and decay of current in an RL circuit with a time constant visible in real time.
By choosing the values of resistance and inductance, a time constant can be selected with a value in seconds. The time constant τ is...
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...
