Electricity & Magnetism

5A10.10 Charged Rods with Electroscope

To demonstrate the separation of electric charge by friction between two neutral materials.

5A10.21 Electrophorus

To produce small amounts of negative or positive static electric charge.

5A10.35 Conservation of Charge

To show, using an extremely high precision electrometer, that charge is conserved.

5A20.10 Charged Rods on Rotating Stands

To demonstrate opposite charges attract and like charges repel.

5A20.20 Charged Rods and Pith Balls

To show electric charge.

5A20.30 Aluminum Pie Pans and Van de Graaf

To show repulsion of like charges.

5A30.16 Copper Rod on a Pivot

To show that a neutral conductor is attracted by both positive and negative charge.

5A40.10 Charge by Induction

To illustrate charging by induction.

5A40.22 Balloon on a wall

To show induced polarization of charge.

5A40.24 Throw Foam Peanuts at a Van de Graaf

To show induced dipole attraction and electrostatic repulsion.

5A40.30 Moving Lumber

To demonstrate the induced polarization of the water molecules in a piece of wood.

5B10.10 Hair on End

To show electrostatic repulsion of like charges.

5B10.25 Levitating Foam Peanut

To model a point charge in an electric field.

5B10.30 Electrostatic Ping Pong

To show the electric field between two charged conducting plates.

5B10.40 Electric Field Lines

To visualize the electric field lines for five common charge distributions.

5B10.50 Torque on a Dipole

To show the torque on an electric dipole in a uniform electric field.

5B20.10 Faraday's Ice Pail

To show the location of charge on a conductor.

5B20.15 Faraday's Ice Pail on Electroscope

To show that all the charge on a charged conductor resides on the surface.

5B20.35 Faraday Shielding

To show that the electric field inside a conductor is zero.

5B30.05 Equipotential Surfaces

To show the electric potential is the same everywhere in a conductor.

5B30.20 Charged Zeppelin

To show the different surface charge densities of the pointed end versus the blunt end of a charged, conducting zeppelin.

5B30.35 Discharge to Various Radii

To demonstrate that for conductors at the same electric potential the rate of discharge of the electric field is higher for a conductor with a smaller radius.

5C10.10 Capacitors Sample

To compare a variety of different types of capacitors.

5C10.20 Parallel Plate Capacitor

To demonstrate capacitance.

5C10.22 Capacitance and Potential

To demonstrate that the potential produced by a charged, conducting plate is reduced when a grounded conducting plate is brought near it.

5C20.20 Force on a Dielectric in an Electric Field

To demonstrate the force on a dielectric in an electric field.

5C30.20 Discharge a Capacitor

To show the quick release of the energy stored in a large capacitor.

5C30.30 Mechanical Equivalent of Energy in a Capacitor

To show the mechanical equivalent of the electric energy stored in a capacitor, and to show that this amount of energy is proportional to the square of the voltage.

5C30.40 Series and Parallel Capacitors

To show the difference in energy stored by a large capacitor in series and in parallel with a smaller capacitor.

5D10.15 Resistance and Area

To show the relationship between resistance and area using carbon paper.

5D10.49 Pencil Line Circuit

To show the resistances of different pencil line circuits.

5D20.10 Resistivity at Low Temperature

To show that resistance changes with temperature.

5D20.13 Tungsten Filament in Liquid Nitrogen

To show a material with a large resistance heats up dramatically when a current runs through it.

5D20.60 Conductivity in Glass

To show that the resistance of glass is lower at higher temperature.

5E40.24 Fuel Cell

To demonstrate operation of a fuel cell

5E40.25 Lemon Battery

To demonstrate a primitive battery using pieces of zinc and copper embedded in a citrus fruit.

5F10.20 Voltage Drop Along a Wire

To demonstrate that the brightness of a bulb in series with a long wire decreases when the length of the wire increases.

5F20.14 Visual Charge Current Flow

To visualize the flow of current in a circuit.

5F20.15 Continuity of Current

To demonstrate Kirchoff’s Junction Rule.

5F20.49 Two Bulbs Series and Parallel

To demonstrate Kirkoff's laws with identical light bulbs wired in series and in parallel.

5F20.50 Series and Parallel Circuit Puzzler

To demonstrate the difference in power output when two bulbs are in series versus when one bulb is in series and two bulbs are in parallel.

5F20.52 Unequal Lamps in Series

To demonstrate the relative brightness of two bulbs of different wattage in series.

5F30.20 RC Time Constant on Oscilloscope

To show the voltage curve when a capacitor is charged.

5F30.23 RC Time Constant with Reversing Switch

To show the difference between the potential across the resistor and the potential across the capacitor as the capacitor charges.

5F30.24 RC Circuit with Long Time Constant and Manual Switch

To show the time constant of an RC circuit.

To show the impact of the RC time constant.

5G10.10 Lodestone

To demonstrate the natural magnetism of a lodestone.

5G10.11 Magnets Through Hand

To demonstrate magnetic force can penetrate a non-ferrous material without obstruction.

5G10.20 Break a Magnet

To show that splitting a magnet in half does not yield two monopoles.

5G20.20 Magnetic Domains

To show the polarization of ferromagnetic domains in a material.

5G20.70 Electromagnet

To show the strength of the magnetic field produced by running current through a coil.

5G30.20 Paramagnetism of Liquid Oxygen

To show paramagnetic materials are attracted to magnetic fields.

5G30.45 Diamagnetic Levitation

To show that diamagnetic materials are repelled by a magnetic field.

5G30.55 Diamagnetic Bismuth

To show the strength of the repulsive force between a magnet and a diamagnetic material.

5G50.10 Curie Point

To show the curie point of nickel.

5G50.50 Meissner Effect

To show the expulsion of magnetic field lines by a superconductor.

5H10.05 Magnets Do Not Have Electric Charge

To demonstrate that a magnet does not have electric charge.

5H10.15 Dip Needle

To show the dip angle of the Earth's magnetic field.

5H10.30 Magnetic Field of a Bar Magnet

To show the magnetic field of a bar magnet.

5H15.10 Current Wire and Compass

To show that a magnetic field is created by a current carrying wire.

5H15.40 Solenoid and Filings

To show the magnetic field of a solenoid.

5H15.50 Coil and Iron Filings

To show the magnetic field of a coil.

5H15.70 Ampere's Law

To demonstrate that when current runs through a solenoid, a uniform magnetic field is induced inside the solenoid.

5H20.10 Magnet on Rotating Stand

To show the force one magnet exerts on another.

5H20.11 Ferrous Material on Rotating Stand

To show that a magnet brought close to the center of an iron rod on a rotating stand will not cause it to rotate.

5H25.10 Field of a Bar Magnet and an Electromagnet

To show that the fields of an electromagnet and a bar magnet are almost identical.

5H25.11 Pick Up Nails

To show that the an electromagnet is similar to a bar magnet.

5H30.10 Crooke's Tube and Magnet

To demonstrate the force on an electron beam by a magnet field.

5H30.15 Bend an Electron Beam

To show the effect of a magnetic field on an electron beam.

5H40.10 Parallel and Antiparallel Current Wires

To show that the force between two adjacent parallel currents is attractive and the force between two adjacent anti-parallel currents is repulsive.

5H40.30 Jumping Wire

To demonstrate the force on a current-carrying wire in a magnetic field.

5H40.36 Wire in a Magnetic Field

To show the relationship between the angle of the magnetic field relative to a current carrying wire and the force on the wire.

5H50.20 Torque on a Loop

To demonstrate that a magnetic field exerts a net torque on a current loop.

5H50.30 Flipping Loop

To show that the forces on a current loop inserted in a magnetic field are determined by the direction of the current.

5J10.23 Back EMF

To demonstrate the back EMF caused by interrupting the current in a large solenoid.

5J20.10 RL Time Constant on Oscilloscope

To show the rise time of the voltage across the resistor in an RL circuit on the oscilloscope.

5J20.20 Coil and Lamp

To show the rise time of the voltage across the resistor in an RL circuit using light bulbs.

5J20.22 RL Series-Parallel Circuit

To show the change in brightness of two bulbs, one in series with an inductor and one in parallel, when a switch is opened and closed.

5J20.30 RL Time Constant with Reversing Switch

To show the difference between voltage across the inductor and the voltage across the resistor in an RL circuit as a function of time.

5J30.10 RLC Ringing

To show the response of an RLC circuit to a DC voltage source.

5K10.10 Rotating a Coil in a Magnetic Field

To show rotating a coil in a magnetic field induces a current.

5K10.13 EMF and Area of Loop

To show the relationship between the area of a loop and the EMF induced when the loop is moved in and out of a uniform magnetic field.

5K10.14 Induced EMF With Loops of Varying Area

To model how the area of a loop affects the induced EMF.

5K10.20 Coil, Magnet and Galvanometer

To show a changing magnetic field induces a current in a coil.

5K10.25 Coil, Magnet and LEDs

To show that the direction of the induced current is different if a coil moves into or out of a uniform magnetic field.

5K10.90 Can Smasher

To show a strong induced magnetic field can crush an aluminum can.

5K20.10 Eddy Current Pendulum

To show eddy currents form in an aluminum disk when it experiences changing magnetic flux.

5K20.20 Saw the B-Field

To show eddy currents are induced in an aluminum sheet when the sheet is moved in and out of a strong magnetic field.

5K20.25 Nib in Tube

To demonstrate Lenz's law.

5K20.30 Jumping Ring

To demonstrate properties of magnetic induction.

5K20.42 Arago's Disk

To show that a magnet on a pivot held above a spinning disk will rotate with the disk.

5K30.51 Primary and Secondary Transformers

To show alternating current through a primary and secondary transformer.

5K40.10 DC Motor

To demonstrate operation of a DC motor.

5K40.81 Telephone Magneto

To show how mechanical energy can be converted into electrical energy.

5K40.83 Bicycle Generator

To demonstrate that a generator converts mechanical to electrical energy.

5L10.20 Capacitive Reactance

To show the voltage across a resistor and a capacitor in an AC series circuit.

5L20.10 RLC Circuit Resonance

To show an RLC circuit can be driven at resonance by an AC voltage source.

5L30.25 RMS DC Equivalent of AC

To compare the AC and DC voltages necessary to supply the same power to a light bulb.

5N10.10 Transmission Line Sample

To demonstrate a coaxial cable transmission line.

5N10.55 Standing Microwaves

To demonstrate microwave standing waves.

5N10.56 Microwave Polarization with Display Meter

To show the polarization of microwaves.

5N10.58 Light Bulb in a Microwave

To demonstrate that electromagnetic waves carry energy.

5N10.60 Radio Frequency Dipole Transmitter and Receiver

To demonstrate that energy is transmitted through space in the form of polarized electromagnetic waves.

5N10.70 Microwave Waveguide

To demonstrate the sudden cutoff of microwave transmission in a parallel plate waveguide as the plate spacing decreases.

5N20.40 Tesla Coil

To demonstrate ionization of gases and electromagnetic radiation.

5N30.10 Projected Spectrum of White Light Dispersion

To show the spectrum of white light.