Revised Tue Jan 21 08:42:31 2003
EM-a1a | Frictional Electricity | An electroscope is charged using charged rods. |
EM-a2b | Conductive Balls | Two lightweight conducting spheres suspended by nylon thread can be used as charge indicators |
EM-a5a | Wimshurst Machine | Generate sparks with a Wimhurst Machine, and explain its workings. |
EM-a5b | Van de Graaff Generator | Describe the operation of the Van de Graaff and show sparks from the ball to a nearby grounded conductor. |
EM-a5c | Van de Graaff Generator--Sound | The engine strains more and more as the charge on the dome increases. |
M-r5a | NaCl crystal model | NaCl model made of wooden balls connected by metal sticks. |
EM-b1b | Hair on End | Charge yourself with a Van de Graaff generator |
EM-b1c | Styrofoam Peanut Blowout | Styrofoam peanuts in a box on top of the Van de Graaff fly out. |
EM-b1e | Tart Pan Blowoff | Tart pans stacked on top of the Van de Graaff fly off. |
EM-b1d | Electric Field Visualizer | Tiny fibers in a clear oil align in the direction of strong applied electric fields. |
EM-a3a | Conductors and Insulators | Shows that charge can be transferred to an electroscope through conductors but not insulators |
EM-a4b | Charged Rods and Aluminum Can | A charged rod can be used to pull a soda can by electrostatic induction |
EM-b2a | Faraday Bucket | Show that charge resides on the outside of a hollow conductor. |
EM-b2f | Gauss with Electric Field Visualizer | Tiny fibers in a clear oil that align in the direction of strong applied electric fields remain randomly oriented inside a charged ring. |
EM-b2b | Radio in a Cage | Surround a radio by a Faraday cage and the signal goes away |
EM-b3a | Surface charge density - balls | Separate two pairs of balls of different radius but same separation are attached to and charged simultaneously with the Wimhurst. |
EM-b3c | Charged Ovoid | Use a proof plane and an electroscope to compare charge densities at different points on an egg-shaped conductor. |
EM-b3g | Lightning Rod | Electrical arcing between two large metal spheres abruptly ceases when the lightning rod is touched to one. |
EM-b3f | Electric Wind with Van de Graaff | A point attached to the Van de Graaff blows a hanging peice of cardboard. |
EM-b3e | Van de Graaff Pinwheel | A pinwheel rotates on top of a van de Graaff generator. |
EM-c1a | Parallel Plate Capacitor | Vary the spacing of a parallel plate capacitor attached to an electroscope. |
EM-c1b | Capacitance as a Function of Area | The rotary plate capacitor is attached to the electroscope. |
EM-c3a | Explosive Capacitor Discharge | Discharge a 10kV, 1uF capacitor through a thin wire or thick screwdriver |
EM-c3b | Bulb and 1 Farad Capacitor | A large (1 Farad) capacitor is charged with a battery then discharged through a light bulb. |
EM-d1a | Wire Resistivity | Place 6V across a set of wires of different diameters and measure the currents. |
EM-d2a | Change of Resistance with Temperature | A coil in series with a lamp is immersed in liquid nitrogen making the lamp glow brighter. |
EM-d2b | Carbon Resistor in Liquid Nitrogen | Drop a resistor in liquid nitrogen and measure its resistance. |
EM-d2c | Conduction in Glass | Heat a glass rod with a flame until its resistance is low enough to sustain conduction. |
EM-d4a | Jacob's Ladder | An arc rises between rabbit ear electrodes attached to a high voltage source. |
EM-e1a | Thermocouple | Show a thermocouple in operation |
EM-f1a | Resistor I-V characteristics | Measure and graph the I-V characteristics for a resistor. The value of the resistance may be varied. |
EM-f1b | Resistance of a Wire | Measure the potential drop along a wire |
EM-f2a | Series Circuit with Bulbs | Show a series circuit of light bulbs |
EM-f2b | Parallel Circuit with Bulbs | Show a parallel circuit of light bulbs |
EM-f2c | Series Parallel Combination | Two bulbs in series with a power supply, and a third bulb in parallel with one of others. |
EM-f1e | Hot Dog Cooker | Spike a hot dog with two nails and cook it. |
EM-c3c | Bulb, 1 Farad Capacitor, and DVM | Monitor the discharge of a 1 Farad capacitor through a light bulb with a digital voltmeter. |
EM-c3d | Bulb, 1 Farad Capacitor, and oscilloscope | Oscilloscope display of a 1 Farad capacitor discharging through a light bulb. |
EM-f3c | RC Time Constant on Scope | Observe the RC decay from a variable gap capacitor and resistor using a square wave input and oscilloscope. |
EM-b1a | Oscilloscope | Show that an electron beam passing between charged, parallel plates is deflected using an oscilloscope. |
EM-h1a | Oersted Experiment | Show that current in a wire deflects a compass needle. |
EM-h3a | e/m tube | Deflect the beam in an e/m tube with magnets |
EM-h4a | Force Between Two Current Carrying Conductors | Show on the overhead projector that long parallel wires with currents in the same (opposite) directions attract (repel). |
EM-h4c | AC and DC Lamps | A magnet is brought near two carbon filament bulbs, one DC powered and one AC powered. |
EM-h4b | Force on Current-carrying wire | A loop of wire swings to the side of a U-magnet's gap when connected to a current-limited power supply. |
EM-h1k | B-Field due to long straight wire | Iron filings are sprinkled on a plexiglas plate through which a long vertical current-carrying wire passes. |
EM-h1m | B-Field due to single coil. | Iron filings are sprinkled on a plexiglas plate through which a single loop of current-carrying wire is mounted |
EM-h1n | B-Field due to solenoid | Iron filings are sprinkled on a plexiglas plate through which a current-carrying solenoid is mounted. |
EM-h5a | Galvanometer | A magnet exerts a torque on a current-carrying coil. |
EM-k4c | Direct Current Motor | Show and explain a DC motor running on batteries. |
EM-m1b | Hall Effect | Measure the transverse potential difference between between the sides of silver or tungsten in crossed electric and magnetic fields |
EM-k1a | Induction Coil and Magnet | A magnet is moved in and out of a coil connected to a galvanometer |
EM-k1b | Induction with Coils and Battery | Attach one coil to a galvanometer, another to a battery and tap switch. Use a core to increase coupling |
EM-k2f | Eddy Current Pendulum -- Classroom | Swing solid. open-slotted, and closed-slotted paddles between the poles of a neodymium magnet. |
EM-k2b | Magnets and Eddy Tubes | Drop magnet and a non-magnetic dummy down an aluminum tube. |
EM-k2c | Magnet and Copper Tube | Drop magnet down a short length of straight copper tubing and watch it fall. |
EM-k2d | Jumping Rings | A solid conducting ring sitting on a vertical solenoid jumps and a split ring doesn't |
EM-k4e | Handheld DC Motor | Run the handheld DC generator with a 1.5 or 3 V battery |
EM-k4a | AC Generator | Rotating a wire loop in a magnetic field generates an AC current in the loop. |
EM-k4b | DC Generator | Generate a DC current by rotating a loop with a split-ring connection in a magnetic field. |
EM-k4d | Hand-held DC Generator | Use the handheld generator to illuminate a bulb. |
EM-k4f | Hand-powered flashlight | The Dynamo--a hand powered flashlight |
EM-k3a | Transformer | Demonstrate step-up and step-down transformers. |
EM-j1b | Back EMF with light bulb | Open the switch of a large coil with a light bulb in parallel |
EM-j2a | Series RL circuit: L/R charge/discharge | "Charging" and "Discharging" of inductor shown with square wave and oscilloscope |
EM-j2b | Series RL circuit: L/R phase shifts | Show phase shifts in a series RL circuit using the oscilloscope. |
EM-j2c | Variable Inductor | A lamp in series or parallel with a variable inductor. |
EM-L2c | non-driven LRC circuit oscillations | Show the oscillations (ringing) when a charged capacitor is connected in series to an inductor and small resistor. |
EM-L2a | 60 Hz LRC circuit | Shows the potential difference across the Capacitor and Inductor at resonance. |
EM-L2b | LRC circuit with function generator | Show the voltage-to-current phase shift and amplitude peaking at resonance in a driven LRC circuit. |
EM-L3a | Bridge Rectifier with LEDs | Operate a bridge rectifier with LEDs at low frequency |
EM-m1a | Diode I-V characteristics | Circuit for measuring the I-V characteristics of a diode |
EM-n1c | Microwave Standing Waves | Use a microwave generator, detector, and metal sheet to show standing waves |
EM-n1b | Microwave Generation and Detection | Show the generation and detection of microwaves including polarization |
EM-n2a | Tesla Coil | Light a fluorescent lamp by holding it near a Tesla Coil |
EM-n2b | AM Radio | Modulate the output of a function generator attached to an antenna and detect the output with a transistor radio |
EM-n3a | Microwave Transmission | Insert different materials (wood, metal, plastic, metal grill of small holes, wet and dry cloths) in a microwave beam |
O-h1a | Polaroids on the Overhead | Show polarization with two sheets of polaroid on the overhead |
O-h1b | Microwave Polarizing Filter | Insert a grid of parallel wires (= cookie cooling rack) in a microwave beam and rotate the grid. |
EM-c2a | Parallel Plate Capacitor with Dielectric | Insert and remove a dielectric sheet from a charged parallel plate capacitor attached to an electroscope. |
EM-a4c | Deflection of stream of water | A charged rod deflects a stream of water. |
EM-e6a | Piezoelectric Demonstrator | Generate sparks by compressing a piezoelectric crystal. |
O-h3q | Demonstrating Strain with Crossed Polaroids | A set of lucite shapes are stressed between crossed polaroids |
O-h3a | Karo Syrup | Insert a beaker of liquid sugar between crossed polaroids. |
O-h3p | Calcite Crystals | Use a polaroid filter to show the polarization of ordinary and extraordinary rays |
EM-c2b | Dissectable Capacitor | This curious capacitor is charged, disassembled, passed around, assembled, and discharged with a spark. |
EM-c2c | Force on a dielectric | Mineral oil climbs in the gap between parallel plates |
EM-g3b | Paramagnetic Aluminum | A small aluminum rod suspended by a thread in the gap of a powerful magnet aligns with the field. |
EM-g3c | Diamagnetic Glass | A small glass rod suspended by a thread in the gap of a powerful magnet orients transverse to the magnetic field. |
EM-g3a | Paramagnetic Liquid Oxygen | Liquid oxygen condensing from air drips into the gap of a strong magnet |
EM-g3d | Diamagnetic Levitator | A small magnetic is suspended in mid-air between two diamagnetic graphite disks. |
EM-g5a | Meissner Effect | Cool a superconductor and it will levitate and float a magnet. |
EM-h1c | Dip Needle | A dip needle is used to show the inclination of the earth's field. |
EM-h1d | Magnet and Iron Filings -- 2D | A small magnet on top of the magnetic domain model apparatus |
EM-h1e | Magnet and Iron Filings -- 3D | A bar magnet surrounded in 3D by a clear acrylic tank filled with a liquid containing iron filings. |
EM-h2c | magnetic dipole in external B field | Compare a magnetic dipole suspended by a spring in a uniform B field with a grad B field. |
EM-h2f | Torque balance with air bearing magnet | Balance the magnetic torque on a dipole with a gravitational torque. |
EM-h2d | Precessing Magnetic Dipole | A magnetic dipole floating in an air bearing precessess in a uniform B field. |
EM-h2e | Classical Magnetic Resonance | Rotate a transverse magnetic field to "flip" the spin of a precessing magnetic dipole. |
EM-h2a | Magnets on Pivots | One magnet is placed on a pivot. The other is used to attract or repel the first |
EM-h2b | Ring Magnets on a Pole | Two or more ring magnets are placed on a vertical pole |
EM-g1a | Lodestone | Show that the lodestone attracts small nails and paperclips. |
EM-g2c | Barkhausen effect | A soft iron core is inserted into a coil inside a magnetic field and connected to an audio amplifier and speaker. |
EM-g2a | Magnetic Domain Model | An array of small compasses shows domain structures |
EM-g2b | Hard vs. Soft magnetic materials | A circular magnetic yoke connecting two wire coils is closed with soft and hard materials |
EM-h1b | Magnetic Permeability | The height to which the jumping rings jumps depends on how far the yoke extends |