Magnetic Field Mapping
Small compasses placed around bar magnets reveal the direction of the magnetic field at discrete points, mapping out field line patterns. Students observe the vector nature of, the dipole field …
Magnetic Fields and Forces Topic
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Tangent Galvanometer
Demonstrates that current-carrying conductors produce magnetic fields by showing the deflection of a compass needle at the center of a coil. The deflection angle reveals the superposition of the coil's …
Dip Needle
Demonstrates the three-dimensional nature of Earth's magnetic field by measuring the magnetic inclination (dip angle). Students see that the field has a substantial vertical component at mid-latitudes, not just the …
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Electromagnetic Slides
Iron filings on transparent slides reveal magnetic field patterns around various current-carrying conductor geometries (straight wire, loop, coil, parallel wires), projected for the class via overhead projector. Students see direct …
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Field around a Conductor
Miniature compasses around a vertical current-carrying wire show the circular magnetic field pattern predicted by Ampere's Law. Students observe field direction reversing with current direction (right-hand rule) and field strength …
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The Magnetic Field of a Solenoid
Iron filings on an overhead projector reveal the magnetic field pattern of a current-carrying solenoid. Students observe parallel field lines inside the coil and a dipole pattern outside, connecting the …
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Magnetic Levitation
Demonstrates magnetic repulsion and force equilibrium by stacking ring magnets with like poles facing on vertical rods. Comparing ceramic and rare earth magnets side by side shows how material properties …
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CRT Monitor in Magnetic Field
A strong magnet visibly distorts the image on a color CRT monitor by deflecting the electron beams via the Lorentz force. Students observe the cross-product relationship between field direction, electron …
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Electron Beam Tube
A visible electron beam in a Crookes tube deflects when a bar magnet is brought near, directly demonstrating. Approaching from different directions shows the cross-product geometry and confirms the sign …
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e/m Experiment
Electrons accelerated through a known potential are deflected into circular paths by Helmholtz coils, enabling direct measurement of. Demonstrates the Lorentz force on moving charges and connects to Thomson's discovery …
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Force on Parallel Conductors
Shows the magnetic force between parallel current-carrying wires: parallel currents attract, antiparallel currents repel. A fiber optic lamp projects wire shadows onto a white backdrop so the motion is visible …
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Jumping Wire
Demonstrates the Lorentz force on a current-carrying wire in a magnetic field. Students apply the right-hand rule to predict the wire's motion, then verify by reversing current polarity.
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Ampere's Motor
A current-carrying axle rolls along conducting rails in a magnetic field, demonstrating. A DPDT switch reverses current direction, reversing the force — a direct illustration of the right-hand rule and …
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Leeds and Northrup Ballistic Galvanometer
Illustrates the moving-coil galvanometer principle: current through a suspended coil in a magnetic field produces torque, deflecting a mirror whose rotation is read optically. A historical example of precision analog …
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Welch Lecture Table Meter
Demonstrates the operating principle of a d'Arsonval (moving-coil) galvanometer. The open construction allows students to see the coil, magnet, and suspension while the schematic on the dial face illustrates the …
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Current Loop in Magnetic Field
A current-carrying coil suspended in a horseshoe magnet's field rotates to align with the field, demonstrating the torque on a magnetic dipole. Students observe the motor principle: magnetic forces on …