Induction and Faraday's Law

What it shows:

A rectangular block of copper (measuring 6"×6"×2"), offers VERY little resistance to eddy currents generated by dragging a magnet across its surface. Thus the Lorentz force between the eddy currents and magnetic field is quite strong and...

What it shows:

A magnet tethered over a spinning aluminum disc levitates due to induced currents in the disc.

How it works:

As the disc spins, electrical currents are induced in the aluminum as it moves with respect to the magnet. These induced currents...

What it shows:

It's impossible to magnetically levitate an object with static magnetic fields. However, it's posible to levitate a magnet with another hand-held magnet by taking advantage of eddy currents.

How it works:

A rectangular block of copper (6"×6"...

What it shows:

Eddy currents set up in a copper paddle as it moves through a magnetic field oppose and dampen its motion. Slits cut into the paddle reduce the damping effect.

How it works:

The pendulums are made of copper consisting of a 1/2" diameter rod...

What it shows:

A sheet of aluminum falls slowly between the poles of a magnet because induced currents in the sheet set up magnetic fields which oppose the motion.

How it works:

As the aluminum sheet falls between the poles of the magnet, eddy currents are...

A 60 Hz AC magnetic flux from an iron core induces an emf in a suspended coil of wire. With appropriate capacitance added, the coil will be attracted to, repelled from, or not affected by the magnetic flux.

What it shows:

When the suspended coil is...

An empty aluminum soft drink can, placed inside a coil of wire, is made to implode when a capacitor is discharged through the coil.

What It Shows:

A dramatic demonstration of Faraday induction and of the repulsion of oppositely directed electric currents...

What it shows:

A changing magnetic flux induces a current in a metal ring; the magnetic field due to this current opposes the primary field, repelling the ring and flinging it into the air. That's the simple "hand waving" explanation for the beginner...

What it shows: 

An emf is induced between the ends of a wire moving back and forth in the presence of a magnetic field.

How it works: 

The ends of a monochord wire are connected to an oscilloscope as illustrated:

Plucking the wire sideways produces no signal...

What it shows:

A step down transformer can have a sufficient increase in current in the secondary to heat and melt iron.

How it works:

The primary is a 100 turn coil that is connected to the mains 110V supply. The secondary is a 9 turn coil made of 9 x 9mm...