5A Electrostatics

• 10. Producing static charge

.10 Charged rods Charged rods touch an electroscope.

.21 Electrophorus A square of pvc or acrlic is rubbed and contacted by a metal plate.

.35 Conservation of charge Show equal and opposite charges.

• 20. Coulomb's Law
  .10 Rods and pivots Charged rods on a pivot are repelled or attracted.

.20 Pith balls Pith balls are suspended and a charge is put in place.

• 22. Electrostatic Meters

.10 Leybold electroscope An electroscope with a verticle needle.

.30 Foil leaf  electroscope An electroscope with a two hanging foil leaves.

.71 Pasco electrometer An electrometer with a meter for the overhead.

.72 Pasco overhead electroscope A horizontal electroscope is placed on the overhead.

.80 Klinger/Leybold electrometer amplifier A high impedance buffer with unity gain for a voltmeter.

• 30. Conductors and Insulators
  .20 Conductor insulator semiconductor Doped glass is heated to change resistance.

• 40. Induced Charge

  .10 Charge by induction A charged rod is put close to an electroscope.

  .22 Balloon on a wall A balloon is rubbed placed onto a verticle wall.

  .24 Electric soap bubbles Blow soap bubbles at a charged Van de Graaf generator.

  .30 2 X 4 on a pivot A length of  2X4 lumber rotates on a pivot.

  .35 Metal rod on a pivot A metal rod on a pivot is attracted by both neagtive and positive charges.
  

• 50. Electrostatic Machines
  .10 Wimshurst  Crank a generator and produce a charge.
  .30 Van de Graaff  A rubber belt rubs over a felt pulley and deposits a charge onto a dome.
  .50 Franklin's Wheel  Charges on the tips of needles force a wheel to spin.

5B Electric Fields and Potential

• 10. Electric Field

.10 Hair on end Stand on a stool and charge yourself.

.25 Foam Peanuts Styrofoam peanuts are placed in a uniform electric field.

.40 Grass Seed Electric Field Lines Grass seed is lined up by an applied electric field.
.25 Torque on a dipole Styrofoam peanuts are placed in a uniform electric field.

• 20. Gauss's Law

.15 Gauss's Law Charge is on the outside of a conductor.

.30 Charged Mylar Balloons Charge is put onto two helium filled balloons.
.35 Radio in a cage A radio is placed in a faraday cage.

• 30. Electrostatic Potential

.35 Point and Sphere Discharge a Van de Graaf with a needle or a sphere.

5C Capacitance

• 10. Capacitors

.10 Sample Capacitors A variety of capacitor energys, voltages and capacitances.

.20 Demonstration Capacitor Vary the spacing of a parallel plate capcitor.

• 20. Dielectric

.33 Torque on a Dipole An electric dipole undergoes a torque by an external electric field.

• 30. Energy stored in a capacitor.

.20 Discharge a Capacitor A large capacitor is shorted with a nail.
.30 Energy in a Cap A capacitor is discharged through a motor that lifts a weight.

5D Resistance

• 20. Resistivity and Temperature.

.10 Resistance at low temperature A coil of wire is immersed in liquid nitrogen.
.55 Zero Resistance Cool a Hi-Tc superconductor and measure the resistance.
.60 Conductivity in Glass Heat glass until it is hot enough to sustain a current.

• 40. Cells and Batterys.

.25 Lemon Battery Zinc and copper inserted into a lemon.
.xx Fuel Cell A hydrogen Fuel Cell powers a fan motor.


5F DC Circuits

• 10. Ohm's Law

.20 Voltage drop along a wire A slider with a lamp becomes dimmed when the elongated.

• 20. Circuit analysis
  .49 Simple circuits Basic series and parallel circuits with lamps.
  .50 Circuit Puzzler Combination series and parallel circuit with lamps.

30. RC Circuits
.20 RC charge curve Show the voltage curve for a charging capacitor.
.60 Neon relaxation oscillator A neon lamp repeatedly flashes with the RC time rate to discharge a cap.

5G Magnetic Materials

• 10. Magnets
  .10 Lodestone Natural lodestone holds a magnetic field.
  .11 Magnets through your hand A pair of strong neodymium iron boron act through the hand.

• 20. Magnet Domains

.20 Magnetic Domains The magnetic domains within a material are viewed.
.30 Paramagnetism and Diamagnetism The properties of paramagnetic and diamagnetic materials are shown.

• 50. Temperature and Magnetism
  .10 Curie Point Iron loses its magnetic attraction when heated.
  .50 Meissner Effect Cool a superconductor with LN and levitate a permanent magnet.
  

• 10. Magnetic Fields

.30 Iron filings Iron filings show the dipole field arrangement on the OHD.
.61 Magnetic Shielding Mu metal is used to show shielding.

• 15. Fields and currents
  .10 Magnetic Field around a wire Show the magnetic field surrounding a long wire.
  .40 Solenoid and filings Show the magnetic field around a solenoid.
  .47 Long solenoid Show the magnetic field inside and outside.
  .50 Field around a toroid Show the field around a toroid with a compass.

• 20. Forces on magnets
  .10 Two magnets on pivots One magnet attracts or repels another magnet.

• 25. Magnet and electromagnet
  .10 Magnet and electromagnet  Iron filings show that the field of a bar magnet and an electromagnet are similar.
  .11 Pick up nails   Iron nails are similarly attracted to both a permanet bar magnet and an electromagnet

• 30 Force on a moving charge
  .10 Cathode ray tube An electron beam is deflected by a magnet.

• 40 Force on a current wire
  .10 Parallel current wires A pair of current wires are attracted or repelled.
  .30 Jumping wire A current wire is deflected by a magnet.

• 50 Torque on a current loop
  .20 Torque on a loop A current loop shows a torque in a magnetic field.
  .30 Flipping loop A current loop is OK or not OK depending on direction.

        5J-Inductance

• 10 Self Inductance
  .23 Back emf One half of an AC neon bulb is made to flash

• 20. LR Circuits
  .20 RL Circuit A lamp in series with a coil.

• 30. RLC Circuits DC
  .10 Ringing in a tank circuit A tank circiut is hit with a slow square wave and the ringing is shown on a scope.

        5K-Electromagnetic Induction

• 10. Induced currents
  .20 Coil, magnet and galvo A magnet is moved in and out of a coil.
• .80 Homopolar Motor A conductor moves in a B field
  .90 Can Smasher A rapidly changing magnetic field crushes a Coke can.

• 20. Eddy currents
  .10 Eddy Current Pendulum A magnet is dropped into a tube.
  .25 Nib in Tube A magnet is dropped into a tube.
  .30 Jumping ring A magnet is dropped into a tube.
  .42 Arago's Disk A magnet pivoted above a spinning disk will rotate.
  .60 Barlow's Wheel A copper disk is rotated between the poles of a strong magnet .

• 30. Transformers
  .50 Jacob's Ladder A step up transformer creates a climbing arc.
  .51 Primary and Secondary A transformer secondary has the the load removed from the primary.

• 40. Motors and Generators
  .10 DC Motor A current loop rotates in a magnetic field.

        5L  AC Circuits

• 10. Impedance
  .10 Inductive Reactance An RL circuit is driven with a sine wave.
  .30 Capacitive Reactance An RC circuit is driven with a sine wave.

• 20. RLC  Circuit AC
  .10 RLC circuits An RLC circuit is driven with a sine wave.

5M-Semiconductors and Tubes

• 10. Semiconductors
  .10 Hall Effect A Hall probe.
  .60 PN junction photocell Light on a photocell powers a fan.
  .63 Semiconductors A white light shines on a slice of doped silicon that is connected to an ohmeter.

• 20. Tubes
  .33 Vacuum Tubes A vacuum tube diode.

5N-Electromagnetic Radiation

• 10. Transmission Lines and Antennas
  .10 Sample Transmission Line A section of coaxial cable.
  .55 Standing Waves A Microwave transmitter is reflected off an adjustable plate and recieved by an antenna.
  .60 RF Transmitter and receiver A 100 Mhz tank circuit transmitter is recieved by an antenna.

• 20.
  .40 Tesla Coil A tank circuit transmitter shows high frequency and high voltage.

• 30. Electromagnetic Spectrum
  .10 Projected Spectrum White light is refracted by a prism.

This web page was last updated on 1/19/00. Please e-mail your comments or suggestions to Gerald_Zani@brown.edu