Electricity and Magnetism

Simple RL and RC circuits serve as high-pass and low-pass audio frequency filters.

What it shows:

Simple RL and RC circuits act as a passive high-pass and low-pass audio frequency filters. Their effect is clearly evident when listening to music (or white...

What It Shows

The amplitudes and relative phases of the voltages across the individual elements of a series RLC circuit varies with the frequency of the driving voltage. The voltages of the three elements plus the driver are plotted simultaneously on an...

What It Shows

The current in a circuit consisting of a capacitor, inductor, and resistor will oscillate back and forth as the capacitor charges and discharges.

How It Works

The circuit layout is shown in the figure below. Initially the knife switch links the...

Play different notes by shortening the coil.

The visible part of the electromagnetic spectrum is represented by less than an octave of the keys; UV, IR, and microwaves are also indicated.

What it shows:

The keys of a piano are used to represent the electromagnetic spectrum, illustrating the narrow...

10 cm microwaves are used for the demonstration of travelling and standing waves, reflection, interference, refraction, diffraction, absorption, polarization, tunneling, and waveguides.

What it shows:

The following is a sequence of experiments that can...

Video of our demo in action https://www.youtube.com/watch?v=wUpOlqbHcjI

What it shows:

The following is a sequence of experiments that can accompany a standard lecture on electromagnetic waves. The entire sequence is quite long and you may not want to do...

What it shows:

The transmission and detection of radio frequency electromagnetic radiation by use of LC oscillator circuits recreates the discovery by Hertz of a method to generate and detect electromagnetic waves.

How it works:

The core of the apparatus...

What it shows:

Static 3-D stylized model of an electromagnetic wave, with two sets of sinusoidal fins at 90° representing the E and B fields.

How it works:

The wave packet model consists of a wooden spine with E and B fins of 1cm wooden dowels. A plastic...

Light, passing through heavy glass, has its direction of polarization rotated slightly if a magnetic field is applied to the glass.

What it shows:

In 1845, Michael Faraday discovered experimentally that a magnetic field can affect the polarization of light...