Electric Fields in Matter

What it shows:

The depth to which electromagnetic radiation can penetrate a conducting surface decreases as the conductivity and the oscillation frequency increase. This demo compares the skin depth of AM and FM radio frequencies, and shows just how small...

What it shows:

The use of a parallel plate capacitor to show the dielectric constant of various materials.

How it works:

The capacitor consists of two 1/4" (6mm) aluminum plates 20 cm in diameter. They are mounted on insulated posts to an optics rail (figu...