PIRA 5K10.00 INDUCED CURRENTS AND FORCES

DCS #DEMONSTRATIONREFERENCEABSTRACT
5K10.00Induced Currents and Forces
5K10.10sliding railPIRA 500
5K10.10sliding rail5K10.10Slide a brass bar riding on two brass rails out of the mouth of a horseshoe magnet and display the current on a galvanometer.
5K10.10sliding rail inductorEq-1Slide a bar on rails attached to a galvanometer through the mouth of a horseshoe magnet.
5K10.11mu metal sheildEq-2The sliding rail with a mu-metal shield gives the same result.
5K10.12mu metal shield and insulatorEq-3The sliding rail with an insulated mu-metal shield still gives the same result.
5K10.13motional EMFE-218Directions on making an apparatus for demonstrating motional EMF. Reference: Am. Phys. Teacher, 3,57,1935.
5K10.15wire, magnet, and galvanometerPIRA 500
5K10.15moving wire with magnetE-215A straight wire connected to a galvanometer is moved rapidly through the poles of a strong magnet.
5K10.15Wire and magnetDisc 20-11Move a wire connected to a galvanometer in and out of a horseshoe magnet.
5K10.16tape head modelPIRA 1000
5K10.17swinging bar in magnet31-1.1A bar connected to a galvanometer is swung in and out of a permanent magnet. ALSO - two other demonstrations.
5K10.18coil pendulum in magnetAJP 49(1),90A 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.
5K10.19measuring magnetic inductionAJP 28(8),745A 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.
5K10.20induction coil with magnet, galv.PIRA 200A magnet is moved in and out of a coil of wire attached to a galvanometer.
5K10.20induction coil with magnet, galv.5K10.20A magnet is moved in and out of a coil of wire attached to a galvanometer.
5K10.20big coilAJP 48(8),686Make the coil large enough for the instructor to walk, run, etc. through.
5K10.20galvanometer, coil and magnetEk-3Move a magnet through a coil connected to a galvanometer.
5K10.20direction of induced currentsEk-3Use each end of a magnet with a coil and galvanometer.
5K10.20induction coil and magnetE-216Move a bar magnet in and out of a coil connected to a galvanometer. Turn the coil with a fixed magnet.
5K10.20induction coil, magnet, galvanometerE-8aA many turn coil attached to a projection galvanometer is flipped over or a magnet is thrust through.
5K10.2110/20/40 coils with magnetPIRA 1000
5K10.2110/20/40 coils with magnetDisc 20-12Coils of 10, 20, and 40 turns are attached to a galvanometer.
5K10.22string and copper induction coils31-2.1A magnet is passed in and out of a copper coil hooked to a millivoltmeter and string loop hooked to an electrometer.
5K10.23mutiple induction coilsAJP 28(1),81Wind 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.
5K10.24number of turns and induced EMFE-217Combine coils of 5 cm diameter with 1,2,5,10,15 turns in various ways to show induced EMF proportional to number of turns.
5K10.25coil and lamp, magnetPIRA 500
5K10.25coil and lamp, magnet5K10.25
5K10.25inductive coil with lampDisc 20-17Swing a coil attached to a lamp through the gap of a horseshoe magnet.
5K10.26induction effects of hitting the barE-224Put 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.
5K10.30induction with coils and batteryPIRA 200Attach one coil to a galvanometer, another to a battery and tap switch. Use a core to increase coupling.
5K10.30induction with coils and battery5K10.30Two coils face each other, one attached to a galvanometer, the other to a battery and tap switch. Coupling can be increased with various cores.
5K10.30galvanometer, coils and batteryEk-4Two coils are in proximity, one attached to a galvanometer, the other to a switch and battery.
5K10.30induction coils with battery31-2.2Change the position of the secondary as the current is interrupted in the primary.
5K10.30two coilsDisc 20-20Changing the current in one coil causes a current in the other.
5K10.31induction coils with batteryE-219Two coils are wound on an iron ring, one connected to a galvanometer, the other to a battery and switch.
5K10.32induction coils and batteryE-220Two coils, one connected to a galvanometer, the other to a battery through a rheostat to allow continuous variation of current.
5K10.33induction coils with battery31-2.3The voltage to a long three layered solenoid is interrupted with various layers active and various sensor loops inside.
5K10.36discovering inductionAJP 49(6),603Repeat the original Faraday experiment and no one realizes the galvanometer twitch is meaningful.
5K10.37ramp induction coils31-2.4A galvanometer detects a steady current from one Helmholtz coil as a second coil is excited with a voltage ramp.
5K10.38changing the air gap31-3.7Change the air gap between two coils and show the induced voltage.
5K10.39current from changing air gap32-3.24Change the size of the air gap in an electromagnet and observe a transient change in the current energizing the coil.
5K10.40induction coils with corePIRA 1000
5K10.40iron core in mutual inductanceEk-7The effect of an iron core is demonstrated as a battery is connected to the primary.
5K10.41insert coreE-221While one coil has a continuous current, insert and remove cores of iron, copper, and brass.
5K10.42two coils on a toroid31-3.2Two coils wound on opposite sides of a toroidal core show inductive coupling when current is switched in one coil.
5K10.45large mutual inductance31-3.3Change the current steadily in a large transformer and watch the voltage in the secondary.
5K10.48current coupled pendulaPIRA 1000
5K10.48current-coupled pendulaDisc 20-16Interconnected coils are hung as pendula in the gaps of two horseshoe magnets. Start one swinging and the other swings.
5K10.50time integral of induced EMFEk-5The induced current from a coil is displayed on a storage oscilloscope while the current is changed at various rates in a second coil.
5K10.52induction on the air trackAJP 43(6),555A loop of wire on an air cart passes through a magnet. Show on a scope.
5K10.55HO car in a magnetic tunnelAJP 53(1),89The induced EMF is observed on an oscilloscope as a brass wheeled train car passes along a track through a large magnet.
5K10.60earth inductorPIRA 500
5K10.60earth inductorEk-6the deflection of a ballistic galvanometer from a flip coil is compared to a standard flux.
5K10.60Earth coilDisc 20-13Flip the standard Earth coil attached to a galvanometer.
5K10.61earth inductorE-222Several 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.
5K10.62rotating coil magnetometerAJP 29(5),329Orient a motor driven coil in various ways in the earth's field while the output is displayed on an oscilloscope.
5K10.62earth inductor integrating ampAJP 44(9),893Replace the ballistic galvanometer with an integrating amp (circuit given).
5K10.62earth inductor with VFCAJP 57(5),475A voltage-to-frequency converter replaces the ballistic galvanometer in the earth inductor demonstration.
5K10.62earth inductor on oscilloscopeAJP 52(3),279Subsititute an oscilloscope for the galvanometer and look at the induced voltage versus time.
5K10.62earth inductor integratorAJP 55(4),379Replace the galvanometer with a integrator and voltmeter.
5K10.63rotating coil magnetometerAJP 29(5),333Display the signal from a motor driven coil on an oscilloscope.
5K10.63earth inductor compassE-223A motor driven coil of several hundred turns gives a different galvanometer deflection depending on the orientation.
5K10.65jumping ropePIRA 1000
5K10.65jumping rope5K10.65
5K10.70What does a voltmeter measure?PIRA 1000
5K10.70What does a voltmeter measure?5K10.70Same as AJP 50(12),1089.
5K10.70what do voltmeters measure?AJP 50(12),1089Two identical voltmeters connected at the same points in a circuit around a long solenoid give different readings.
5K10.71paradoxAJP 49(6),603Feynman - "When you figure it out, you will have discovered an important principle of electromagnetism".
5K10.71what does a voltmeter measure-letterAJP 51(12),1067Add a third voltmeter that can be moved for continuously varying readings.
5K10.71Faraday's law teaserAJP 37(2),221Measure the voltage between two points at the end of an electromagnet through different paths.
5K10.71Faraday's law teaser - addendumAJP 38(3),376Clears up ambiguities in AJP 37(2),221.
5K10.78induced current liquid crystalAJP 45(3),309Liquid crystals placed over laminated copper conductors show heating of various configurations.
5K10.80Faraday's homopolar generatorAJP 41(1),120Turn 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.
5K10.80homopolar generator31-2.12A homopolar generator shows the relation between electric and magnetic fields. Not the most obvious demonstration.
5K10.81radial homopolar generatorAJP 56(9),858A variation on the axial field homopolar motor (Barlow's wheel).
5K10.85Rogowski coilAJP 43(4),368A direct demonstration of Ampere's circuital law using a flexible toroidal coil.
5K10.85magnetic wheelAJP 45(11),1128Induced current from a unipolar machine using a magnetic wheel.
5K10.85Rogowski coil31-1.24A flexible coil hooked to a ballistic galvanometer is used to give a direct measurement of the magnetic potential between two points.
5K10.85Ampere's law31-1.23Use 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.
5K10.90electromagnetic can breakerDisc 20-27A large pulse of induced current in a soda can blows it apart.
5K10.99rocking plates31-1.7Demonstrates some difficult concepts of flux linkages using sheets of metal instead of wires.

ReferenceDescription
M-1Sutton
Ma-1Freier & Anderson
M-1dHilton
8-2.8Meiners
1A12.01University of Minnesota Handbook
AJP 52(1),85American Journal of Physics
TPT 15(5),300The Physics Teacher
Disc 01-01The Video Encyclopedia of Physics Demonstrations

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