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# Electricity & Magnetism

5E40.24/4F30.15 Fuel Cell

# Electricity & Magnetism Demonstrations

## Demonstration Manager: Gerald Zani

Thousands of volts discharge between conducting spheres

Coulomb's Law Producing Static Charge To demonstrate electric charge . 5A10.10 To produce small amounts of negative or positive static electric charge. 5A10.21 To show that the total amount of charge is conserved when charges are separated by friction. 5A10.35 To demonstrate the separation of electric charge. 5A20.10 To show electric charge. 5A20.20 To show coulomb repulsion. 5A20.30 To measure electric charge. 5A22.10 To show electric charge. 5A22.30 To measure the small voltages or small currents due to electric charges. 5A22.71 To show electric charge. 5A22.72 To show electric charge. 5A22.80 To show that a neutral, uncharged conductor is attracted by both positive and negative charge. 5A30.16 To show that glass is an insulator when cold, but when heated the resistance changes and it becomes a conductor. 5A30.20 To illustrate charging by induction. 5A40.10 To show induced polarization of charge 5A40.22 To show induced dipole attraction and repulsion. 5A40.24 To demonstrate polarization of water molecules. 5A40.30Name is Different on Page To generate high electrostatic potentials. 5A50.10 To demonstrate operation of Van de Graaf and illustrate electrostatic concepts. 5A50.30 To show electric charge repulsion. 5B10.10 A foam packing peanut between two charged plates represents a point charge in an electric field. 5B10.25 A conductive pith ball bounces back and forth in the electric field between two charged plates. 5B10.30 Show electric field lines for five different charge distributions. 5B10.40 A large model for the torque induced on an electric dipole in a uniform electric field. 5B10.50 To show the location of charge on a conductor. 5B20.10 To show that the charge deposited inside a conductor resides on the outside surface, and the charge inside is zero. 5B20.15 To show the shielding effect of a Faraday Cage. 5B20.35 To show that the electric field inside a conductor is zero. 5B20.36 To show the different surface charge densities of the pointed end versus the blunt end of a charged, conducting zeppelin. 5B30.20 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. 5B30.35 To compare a variety of capacitor flavors and colors. 5C10.10 To show that if the amount of charge is constant, then changing the distance between the plates of a capacitor will also change the capacitance and the voltage, Q=CV. 5C10.20 To demonstrate that an isolated plate of a capacitor becomes saturated easily with charge and can build up a potential but when a second grounded plate is brought nearby, the potential for that charge is reduced and now you can add a lot more charge to the same plate. 5C10.22 Demonstrate the force on a dielectric in an electric field. 5C20.20 To model the torque caused by the force of an external electric field acting on an electric dipole moment. 5C20.33 Displacement Current The magnetic field generated by a displacement current is measured in between two plates of a capacitor. 5C20.60Photo To show the quick release of  the energy stored in a large capacitor. 5C30.20 Mechanical Equivalent 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. 5C30.30Photo A large capacitor is discharged after being charged first in series then in parallel with a small capacitor to show the difference in the energy stored in both cases. 5C30.40 To show the relationship between resistance and area using carbon paper. 5D10.15 To show the resistances of different pencil line circuits. 5D10.49 To show zero resistance. 5D20.55 To show that the resistance of glass is lower at higher temperature. 5D20.60Duplicate Name To show that the resistance changes with the temperature. 5E20.10 This is a demo of fuel cell technology. 5E40.24 Creation of a primitive battery using pieces of zinc and copper embedded in a citrus fruit. 5E40.25 Peltier and Seebeck effect demonstrated through a single bismuth-telluride thermoelectric couple. 5E50.60 To show the resistance of a wire is proportional to length, and to show how the power to a lamp is decreased when the resistance of the wire is increased. 5F10.20 To illustrate the motion of electrons in a circuit. 5F20.15 To demonstrate Kirkoff's laws with a series and a parallel connection of two identical light bulbs. 5F20.49 A simple circuits to encourage thought about the relationships between resistance, current, voltage and power. 5F20.50 To show the voltage curve when a capacitor is charged. 5F30.20 To show the difference between the potential across the resistor over time and the potential across the capacitor over time. 5F30.23 To show the time constant of an RC circuit. 5F30.24 To show the RC time constant. 5F30.60 To demonstrate the magnetism of a natural lodestone. 5G10.10 To introduce the idea that the magnetic force can penetrate your hand (a non-ferrous material) without apparent obstruction. 5G10.11 To show that splitting a magnet in half does not yield two monopoles. 5G10.20 To show the polarization of ferromagnetic domains in a material. 5G20.20 To show the strength of the magnetic field produced by running current through a coil. 5G20.70 To show paramagnetic materials are attracted to magnetic fields. 5G30.20 To show diamagnetic levitation 5G30.45 To the curie point of Nickel. 5G50.10 To show the Meissner effect. 5G50.50 To show the dip angle of the Earth's magnetic field. 5H10.15 To visualize the magnetic field of a bar magnet. 5H10.30 Magnetic Shielding To demonstrate magnetic shielding. 5H10.61Photo To show that a  magnetic field is created by a current wire. 5H15.10 To show the magnetic field of a solenoid. 5H15.40 To show the field inside, outside, and at the ends of a long solenoid. 5H15.47 To show the field of a toroid. 5H15.50 When current runs through a solenoid, a uniform magnetic field is induced inside the solenoid 5H15.70 To show the force one magnet exerts on another. 5H20.10 A spinning magnet levitates over a toroidal magnet. 5H20.22 To show that the an electromagnet has a field that is similar to a bar magnet. 5H25.10 To show that the an electromagnet is similar to a bar magnet. 5H25.11 To demonstrate the force on an electron beam by a magnetic field from a magnet. 5H30.10 To demonstrate the force on an electron beam by a magnetic field from a pair of Helmholtz coils. 5H30.15 To show that the current in a wire will create a magnetic field. 5H40.10 To demonstrate the force on a current-carrying wire in a magnetic field. 5H40.30 To show the relationship between the angle of the magnetic field relative to a current carrying wire and the force on the wire. 5H40.36 To demonstrate how an electric potential difference and a current can be generated when a conductor moves through a magnetic field. 5H40.60 Torque on a Loop To demonstrate that a magnetic field exerts a net torque on a current loop. 5H50.20 To show that the forces on a current loop inserted in a magnetic field are determined by the direction of the current. 5H50.30 To demonstrate the back EMF caused by interrupting the current of  a coil. 5J10.23 To show the rise time of the current through the resistor in an RL circuit. 5J20.10 To show self inductance and back EMF. 5J20.20 To show the change in brightness of two bulbs, one in series and one in parallel with an inductor, when a switch is opened and closed. 5J20.22 To show the difference between voltage across the inductor over time and the voltage across the resistor over time. 5J20.30 To show the ringing from an RLC circuit. 5J30.10 Rotating a Coil in a Magnetic Field To show rotating a coil in a magnetic field induces a current. 5K10.10 To show that a current is induced in a coil by a changing magnet field. 5K10.20 To demonstrate generation of DC voltage with the rotational motion of a magnet and a conductor using a method which may involve an explanation other than electromagnetic induction.  This demonstration is also known as the "Motional EMF Demonstration", the "Homopolar Generator" and the "Unipolar Motor". 5K10.80 To crush an aluminum can with a strong field strength, specifically an electromagnetic field. 5K10.90 To show the braking effects of induced eddy currents. 5K20.10 To show Lenz's Law in a dramatic way. 5K20.25 To show some concepts about magnetic induction. 5K20.30 To show that a magnet on a pivot held above a spinning disk will rotate. 5K20.42 To show a step up transformer. 5K30.50 Primary and Secondary TransformersCurrently Unavailable. Currently Unavailable. 5K30.51 To show how a DC motor works. 5K40.10 To show how mechanical energy can be converted into electrical energy. 5K40.81 To demonstrate a how a person can pedal a simple DC generator and transform mechanical energy into electrical energy capable of delivering up to a kilowatt of power directly to a resistive load. 5K40.83 To show the L/R time constant of an inductive circuit and that the voltage leads the current by 90 degrees. 5L10.20 To demonstrate resonance in an LC circuit. 5L20.10 To compare the voltages for AC and DC current necessary to produce the same power. 5L30.25 Hall Probe To show the hall effect. 5M10.10Photo To show a PN photocell. 5M10.60 To show a silicon semiconductor. 5M10.63 To show a vacuum tube. 5M20.33 To show a large coaxial cable transmission line. 5N10.10 To show the polarization of microwaves. 5N10.16 To demonstrate microwave standing waves. 5N10.55 Light Bulb in a Microwave To demonstrate the electromagnetic fields are waves with a speed and wavelength that carry energy. 5N10.58 To demonstrate that energy is transmitted through space in the form of electromagnetic waves, and also to show the waves are polarized. 5N10.60 5N10.70 To demonstrate a Tesla coil and show how magnetic induction and resonance is used in the production of high-voltage and the wireless transmission of electricity. 5N20.40 To show the spectrum of white light. 5N30.10

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