Demonstrations

Identifier Title Demo Summary
E&M: ES - 017 Van de Graaff and Pie Tins

Pie placed on top of a Van de Graaff generator fly off when the machine is turned on.

Pie tins rest atop a Van de Graaff generator
E&M: ES - 018 Van de Graaff with Lightning Rod

A lightning rod is used to draw electric charge from Van de Graaff and prevent discharge

A lightning rod attached to a Van de Graaff and discharge ball
E&M: ES - 019 Electric Field Lines

Grass seeds are sprinkled into a plexiglass container of castor oil that has 2 electrodes.  When voltage is applied across the electrodes, the seeds (dipoles) will align to show the electric field.  The image is projected using an overhead projector onto the wall of the lecture hall.

Electric Field lines formed from seeds in castor oil
E&M: ES - 020 Faraday Cage with Radio

A handheld radio is placed inside a cage made of copper wire mesh.  The signal ceases to be heard.

A hand held radio rests next to a Faraday cage.
E&M: ES - 021 Dielectrics and Electrostatic Charge

The variable capacitor is used with the Van der Graaf generator to demonstrate dielectrics in electric fields

Van der Graaf Generator connected to variable capacitor
E&M: ES - 022 Equivalent Energy Storage of a Capacitor

Weights dropped from a height of 1 meter provide an audible measure of the amount of energy stored in each capacitor available for display.

Assorted capacitors and masses and a metal plate
E&M: Ind - 001 Electromagnetic Induction

A small magnet is passed through a coil of wire connected to a voltmeter.  As the magnet passes through the coil, a spike can be read on the meter, showing that current has been created.

A coil of wire, an analog voltmeter, and a small magnet
E&M: Ind - 003 Mini-Electric Generator
E&M: Ind - 005 Electric Generator

Turning the crank of a motor lights 3 bulbs.

Electric generator is wired in parallel to 3 light bulbs
E&M: Ind - 006 Damping by Eddy Current Losses

A copper disk is allowed to swing between two electromagnets.  The motion is dampened by eddy currents.

Dual Electromagnet Apparatus connected to a DC switch
E&M: Ind - 008 Wireless Lamp
E&M: Ind - 009 The Transformer

A transformer is used to step down or step up the voltage of a an electrical outlet

Transformer connected to AC switch and multimeter
E&M: Ind - 010 Jumping Rings

Aluminum rings are launched into the air.

Electromagnet with iron core sits next to power stat.
E&M: Ind - 011 Spark
E&M: Ind - 012 The Choke Coil
E&M: Ind - 013 Current in a Capacitor Bank
E&M: Ind - 014 Jacob's Ladder

A large step-up transformer creates a visible arc

Jacob's Ladder Apparatus
E&M: Ind - 016 Comparison of Resistor and Inductor in Circuits
E&M: Ind - 017 RL Circuit

A waveform is produced on an oscilloscope to show voltage across a resistor and an inductor in a circuit

Apparatus for the RL Circuit Demo
E&M: Ind - 018 Faraday's Law with Oscilloscope
E&M: Ind - 019 Lenz's Law

A cylindrical magnet and a nonmagnetic cylinder are dropped down a long metal tube.  

A metal tube, a metal tube with a slit in the side, a cylindrical magnet, and a nonmagnetic cylinder
E&M: Ind - 021 Loop with Bulb and Electromagnet

A loop of wire near a magnetic field lights an LED

Electromagnet, Loop of wire, LED
E&M: Ind - 022 Lighting an LED with a Spike

A voltage spike is produced by an inductor.

Power Supply, Electromagnet with core, tap switch, LED
E&M: Ind - 023 Lenz's Law - Visible Motion

A magnetic ball rolls down a long L-brackete at a slower pace than a nonmagnetic ball.

Coffee Can, L-Bracket, Magnetic Ball, Nonmagentic Ball
E&M: Ind - 024 LRC Circuit
E&M: Ind - 025 LC Circuit
E&M: Ind - 026 Music and Coils

Sound is wirelessly transmitted from the hand-held radio to a speaker by using coils of wire.

2 coils of wire, a speaker, and a hand-held radio
E&M: M - 001 Magnetic Field Caused by Electric Current

A compass needle moves to realign with a magnetic field created as current flows through a wire.

A wire is suspended above a compass.
E&M: M - 002 Electromagnet with Nails

An iron rod inside a large solenoid becomes a magnet when current passes through the solenoid.

A solenoid with an iron core sits next to a box of nails.
E&M: M - 003 Lifting Magnet

4 D-cell batteries are used to lift a 25-lb weight.

A small electromagnet is suspended above a plate attached to a 25-lb weight.
E&M: M - 004 Magnetization vs. Electrification

Bar magnets and the electrostatics equipment are used to show that magnetization has no effect on electrical behavior.

Magnet + magnet on rotating stand
E&M: M - 005 Jumping Wire

Current flowing through a wire located in a magnetic field will cause the wire to jump.

Wire hangs between poles of large Megatron magnet
E&M: M - 007 DC Electric Motor

A DC electric motor is used to show how electricity and magnetism cause a motor to work.

A DC motor and a power supply sit on a cart
E&M: M - 008 D'Arsonval Galvantometer
E&M: M - 009 Magnetic Materials
E&M: M - 010 Penetration of magnetic Effects

Different materials are used to show the ability of a magnetic field to penetrate through to the nails on the other side.

A magnet, a box of nails, and pieces of rubber, glass, plastic, iron, and copper
E&M: M - 012 Floating Magnet

One magnet floats above another due to repulsive forces.

Two donut-shaped magnets on an acrylic rod repel each other
E&M: M - 013 Breaking a Magnet

A magnet is broken to show that 2 magnets are created, not 2 disconnected poles

A bar magnet with 2 clearly marked poles
E&M: M - 014 Dip Needle

Device that shows the angle of Earth's Magnetic Field

Demonstration Magnetic Dip Needle and Compass
E&M: M - 015 Magnetization using Earth's Magnetic Field
E&M: M - 019 Curie Point
E&M: M - 020 The Hall Effect
E&M: M - 021 Force Between Currents in Parallel Wires

Current flows through two parallel wires.  The current flows in either the same direction or different directions to produce attraction or repulsion, respectively.

Parallel wires mounted against a white back drop.
E&M: M - 023 Current Loop in a Magnetic Field

A coil of wire is suspended between the poles of a powerful horseshoe magnet.  When current is passed through the coil, it aligns itself with the magnetic field present.

Loop of wire hangs between poles of megatron magnet
E&M: M - 025 Liquid Oxygen

Liquid oxygen forms a bridge across the cones of a strong horseshoe magnet.

A dewar of liquid nitrogen and the strong horseshoe magnet with cones
E&M: M - 027 Cathode Ray Tube and Magnet

A magnet exerts a force on the electron beam in a cathode ray tube.

A cathode ray tube rests on a utility cat
E&M: M - 029 FM Antenna
E&M: M - 030 Compass Array

A small array of compass needles and a small bar magnet are used to provide visual evidence of a magnetic field.

Small bar magnet rests on top of the compass needle array
E&M: M - 031 Helmholtz Coil

A circular electron beam forms as a result of a uniform magnetic field

Helmoltz Coil
E&M: M - 032 Magnetic Field Around a Solenoid

A solenoid of wire connected to a power supply produces a magnetic field, visible in a sprinkle of iron filings.

Solenoid of wire woven through plexiglass

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