| DCS # | DEMONSTRATION | REFERENCE | ABSTRACT |
|---|
| 5K10.00 | Induced Currents and Forces | | |
| 5K10.10 | sliding rail | PIRA 500 | |
| 5K10.10 | sliding rail | 5K10.10 | Slide a brass bar riding on two brass rails out of the mouth of a horseshoe magnet and display the current on a galvanometer. |
| 5K10.10 | sliding rail inductor | Eq-1 | Slide a bar on rails attached to a galvanometer through the mouth of a horseshoe magnet. |
| 5K10.11 | mu metal sheild | Eq-2 | The sliding rail with a mu-metal shield gives the same result. |
| 5K10.12 | mu metal shield and insulator | Eq-3 | The sliding rail with an insulated mu-metal shield still gives the same result. |
| 5K10.13 | motional EMF | E-218 | Directions on making an apparatus for demonstrating motional EMF. Reference: Am. Phys. Teacher, 3,57,1935. |
| 5K10.15 | wire, magnet, and galvanometer | PIRA 500 | |
| 5K10.15 | moving wire with magnet | E-215 | A straight wire connected to a galvanometer is moved rapidly through the poles of a strong magnet. |
| 5K10.15 | Wire and magnet | Disc 20-11 | Move a wire connected to a galvanometer in and out of a horseshoe magnet. |
| 5K10.16 | tape head model | PIRA 1000 | |
| 5K10.17 | swinging bar in magnet | 31-1.1 | A bar connected to a galvanometer is swung in and out of a permanent magnet. ALSO - two other demonstrations. |
| 5K10.18 | coil pendulum in magnet | AJP 49(1),90 | A
1 second pendulum with a coil for a bob swings with small amplitude within
a uniform magnetic field. All sorts of variations demonstrating forced, free,
and damped oscillations are mentioned. |
| 5K10.19 | measuring magnetic induction | AJP 28(8),745 | A
rectangular coil in a magnetron magnet is rotated on one side and the other
is suspended from a balance. Change the current in the coil and measure the
force with the balance. |
| 5K10.20 | induction coil with magnet, galv. | PIRA 200 | A magnet is moved in and out of a coil of wire attached to a galvanometer. |
| 5K10.20 | induction coil with magnet, galv. | 5K10.20 | A magnet is moved in and out of a coil of wire attached to a galvanometer. |
| 5K10.20 | big coil | AJP 48(8),686 | Make the coil large enough for the instructor to walk, run, etc. through. |
| 5K10.20 | galvanometer, coil and magnet | Ek-3 | Move a magnet through a coil connected to a galvanometer. |
| 5K10.20 | direction of induced currents | Ek-3 | Use each end of a magnet with a coil and galvanometer. |
| 5K10.20 | induction coil and magnet | E-216 | Move a bar magnet in and out of a coil connected to a galvanometer. Turn the coil with a fixed magnet. |
| 5K10.20 | induction coil, magnet, galvanometer | E-8a | A many turn coil attached to a projection galvanometer is flipped over or a magnet is thrust through. |
| 5K10.21 | 10/20/40 coils with magnet | PIRA 1000 | |
| 5K10.21 | 10/20/40 coils with magnet | Disc 20-12 | Coils of 10, 20, and 40 turns are attached to a galvanometer. |
| 5K10.22 | string and copper induction coils | 31-2.1 | A magnet is passed in and out of a copper coil hooked to a millivoltmeter and string loop hooked to an electrometer. |
| 5K10.23 | mutiple induction coils | AJP 28(1),81 | Wind
coils 1:2:4:4:4 with the 2nd and 4th in the opposite sense, all in series.
Use with a single pole, then use two poles of a horseshoe magnet in two adjacent
coils. |
| 5K10.24 | number of turns and induced EMF | E-217 | Combine coils of 5 cm diameter with 1,2,5,10,15 turns in various ways to show induced EMF proportional to number of turns. |
| 5K10.25 | coil and lamp, magnet | PIRA 500 | |
| 5K10.25 | coil and lamp, magnet | 5K10.25 | |
| 5K10.25 | inductive coil with lamp | Disc 20-17 | Swing a coil attached to a lamp through the gap of a horseshoe magnet. |
| 5K10.26 | induction effects of hitting the bar | E-224 | Put
a 600 turn coil connected to a galvanometer around a soft iron bar and hit
the bar while oriented parallel and perpendicular to the earth's field. |
| 5K10.30 | induction with coils and battery | PIRA 200 | Attach one coil to a galvanometer, another to a battery and tap switch. Use a core to increase coupling. |
| 5K10.30 | induction with coils and battery | 5K10.30 | Two
coils face each other, one attached to a galvanometer, the other to a battery
and tap switch. Coupling can be increased with various cores. |
| 5K10.30 | galvanometer, coils and battery | Ek-4 | Two coils are in proximity, one attached to a galvanometer, the other to a switch and battery. |
| 5K10.30 | induction coils with battery | 31-2.2 | Change the position of the secondary as the current is interrupted in the primary. |
| 5K10.30 | two coils | Disc 20-20 | Changing the current in one coil causes a current in the other. |
| 5K10.31 | induction coils with battery | E-219 | Two coils are wound on an iron ring, one connected to a galvanometer, the other to a battery and switch. |
| 5K10.32 | induction coils and battery | E-220 | Two coils, one connected to a galvanometer, the other to a battery through a rheostat to allow continuous variation of current. |
| 5K10.33 | induction coils with battery | 31-2.3 | The voltage to a long three layered solenoid is interrupted with various layers active and various sensor loops inside. |
| 5K10.36 | discovering induction | AJP 49(6),603 | Repeat the original Faraday experiment and no one realizes the galvanometer twitch is meaningful. |
| 5K10.37 | ramp induction coils | 31-2.4 | A galvanometer detects a steady current from one Helmholtz coil as a second coil is excited with a voltage ramp. |
| 5K10.38 | changing the air gap | 31-3.7 | Change the air gap between two coils and show the induced voltage. |
| 5K10.39 | current from changing air gap | 32-3.24 | Change the size of the air gap in an electromagnet and observe a transient change in the current energizing the coil. |
| 5K10.40 | induction coils with core | PIRA 1000 | |
| 5K10.40 | iron core in mutual inductance | Ek-7 | The effect of an iron core is demonstrated as a battery is connected to the primary. |
| 5K10.41 | insert core | E-221 | While one coil has a continuous current, insert and remove cores of iron, copper, and brass. |
| 5K10.42 | two coils on a toroid | 31-3.2 | Two coils wound on opposite sides of a toroidal core show inductive coupling when current is switched in one coil. |
| 5K10.45 | large mutual inductance | 31-3.3 | Change the current steadily in a large transformer and watch the voltage in the secondary. |
| 5K10.48 | current coupled pendula | PIRA 1000 | |
| 5K10.48 | current-coupled pendula | Disc 20-16 | Interconnected coils are hung as pendula in the gaps of two horseshoe magnets. Start one swinging and the other swings. |
| 5K10.50 | time integral of induced EMF | Ek-5 | The
induced current from a coil is displayed on a storage oscilloscope while
the current is changed at various rates in a second coil. |
| 5K10.52 | induction on the air track | AJP 43(6),555 | A loop of wire on an air cart passes through a magnet. Show on a scope. |
| 5K10.55 | HO car in a magnetic tunnel | AJP 53(1),89 | The induced EMF is observed on an oscilloscope as a brass wheeled train car passes along a track through a large magnet. |
| 5K10.60 | earth inductor | PIRA 500 | |
| 5K10.60 | earth inductor | Ek-6 | the deflection of a ballistic galvanometer from a flip coil is compared to a standard flux. |
| 5K10.60 | Earth coil | Disc 20-13 | Flip the standard Earth coil attached to a galvanometer. |
| 5K10.61 | earth inductor | E-222 | Several variations.
A large (1.5 m x 6 m) single wire loop, collapse a flexible loop on many
turns, a long flexible wire swung like a jump rope are attached to a galvanometer
with the damping turn removed. ALSO the commercial loop to a ballistic galvanometer. |
| 5K10.62 | rotating coil magnetometer | AJP 29(5),329 | Orient a motor driven coil in various ways in the earth's field while the output is displayed on an oscilloscope. |
| 5K10.62 | earth inductor integrating amp | AJP 44(9),893 | Replace the ballistic galvanometer with an integrating amp (circuit given). |
| 5K10.62 | earth inductor with VFC | AJP 57(5),475 | A voltage-to-frequency converter replaces the ballistic galvanometer in the earth inductor demonstration. |
| 5K10.62 | earth inductor on oscilloscope | AJP 52(3),279 | Subsititute an oscilloscope for the galvanometer and look at the induced voltage versus time. |
| 5K10.62 | earth inductor integrator | AJP 55(4),379 | Replace the galvanometer with a integrator and voltmeter. |
| 5K10.63 | rotating coil magnetometer | AJP 29(5),333 | Display the signal from a motor driven coil on an oscilloscope. |
| 5K10.63 | earth inductor compass | E-223 | A motor driven coil of several hundred turns gives a different galvanometer deflection depending on the orientation. |
| 5K10.65 | jumping rope | PIRA 1000 | |
| 5K10.65 | jumping rope | 5K10.65 | |
| 5K10.70 | What does a voltmeter measure? | PIRA 1000 | |
| 5K10.70 | What does a voltmeter measure? | 5K10.70 | Same as AJP 50(12),1089. |
| 5K10.70 | what do voltmeters measure? | AJP 50(12),1089 | Two identical voltmeters connected at the same points in a circuit around a long solenoid give different readings. |
| 5K10.71 | paradox | AJP 49(6),603 | Feynman - "When you figure it out, you will have discovered an important principle of electromagnetism". |
| 5K10.71 | what does a voltmeter measure-letter | AJP 51(12),1067 | Add a third voltmeter that can be moved for continuously varying readings. |
| 5K10.71 | Faraday's law teaser | AJP 37(2),221 | Measure the voltage between two points at the end of an electromagnet through different paths. |
| 5K10.71 | Faraday's law teaser - addendum | AJP 38(3),376 | Clears up ambiguities in AJP 37(2),221. |
| 5K10.78 | induced current liquid crystal | AJP 45(3),309 | Liquid crystals placed over laminated copper conductors show heating of various configurations. |
| 5K10.80 | Faraday's homopolar generator | AJP 41(1),120 | Turn
a large aluminum wheel by hand with the edge of the wheel and a pickoff brush
between the poles of a magnet. Show the induced current on a galvanometer. |
| 5K10.80 | homopolar generator | 31-2.12 | A homopolar generator shows the relation between electric and magnetic fields. Not the most obvious demonstration. |
| 5K10.81 | radial homopolar generator | AJP 56(9),858 | A variation on the axial field homopolar motor (Barlow's wheel). |
| 5K10.85 | Rogowski coil | AJP 43(4),368 | A direct demonstration of Ampere's circuital law using a flexible toroidal coil. |
| 5K10.85 | magnetic wheel | AJP 45(11),1128 | Induced current from a unipolar machine using a magnetic wheel. |
| 5K10.85 | Rogowski coil | 31-1.24 | A flexible
coil hooked to a ballistic galvanometer is used to give a direct measurement
of the magnetic potential between two points. |
| 5K10.85 | Ampere's law | 31-1.23 | Use the Rogowski
coil to examine the magnetic field produced by current in a single wire,
or two wires of parallel and opposing current. Picture, theory. |
| 5K10.90 | electromagnetic can breaker | Disc 20-27 | A large pulse of induced current in a soda can blows it apart. |
| 5K10.99 | rocking plates | 31-1.7 | Demonstrates some difficult concepts of flux linkages using sheets of metal instead of wires. |