Get a set here:
From Amazon: BUY NOW Magnetic Field Viewer set
Viewing Magnetic Poles: visualizing the invisible- tiny iron filings suspended in viscous oil gracefully chain up to reveal the presence of magnetic field lines. Can you determine how the magnetic polls are configured by the structure of the field lines? Here three configurations, initially hidden behind white foam board, create the beautiful mappings of the fields.
Here is the NdFeB neodymium magnet used in this video:
From Amazon: BUY NOW: Neodymium Disk Magnet
Please use extreme caution when handeling strong magnets like this one. Small nails, paperclips, staples and other houlshold object made with iron will interact interestingly with the magnetic field.
Ferromagnetic Interaction: iron rich nails temporarily become dipole magnets in the presence of an intense magnetic field from a large neodymium super magnet. Here the neodymium disk magnet is set with its north pole pointing up, so the point of each nail becomes a south pole (repelling each other) and the head of each a north pole. Imbued with these temporary induced fields, the nails will try to align themselves with the neodymium dipole’s field like compass needles, and the nails will interact with each other in interesting ways.
A KickStarter campaign for resonably priced interactive art:
From KS: Pledge NOW: Cosmic Eye
Cosmic Eye Rheoscopic Device: visualizing the invisible- where suspended microscopic flat crystals reflect light and allow visualization of the fluid's motion. This rheoscopic fluid is special in that the suspended microscopic particles are slightly ferromagnetic and will align with any external magnetic field that is brought near the device. A small magnet within allows interesting interactions as well. From creator and artist Robert Spillner.
Get this new technology here:
From Amazon: BUY NOW: Color Magnetic Viewing Film
Color Gradient Magnetic Film: making the invisible visible and revealing the hidden beauty of the physics in our everyday world. Microscopic cavities in this thin film are filled with suspended magnetic nanoparticles that interact with magnetic fields producing different colors from orange (low field strength) to dark blue (high field strength). Here three “fridge magnets” and a coded neodymium magnet show surprising field complexity when placed under this film.
Levitron Tops were produced in the 1990s and are out of production and getting harder to find. Some models are still available here:
From eBay: BUY NOW: Levitron Top
The Levitron: spin stabilized magnetic levitation- will fly for about 3 minutes or more per launch. The spin rate of the magnetic top must be just right for flight, not too fast or too slow. Air resistance and dissipative interactions between the magnets gradually slow the spin rate and the top falls. Interestingly trapping the top requires precision - the weight of the top must be adjusted to within 1 gram to achieve equilibrium between the pull of gravity and the magnetic repulsion from the large donut shaped magnet in the wood base.
I used neodymium disk magnets, small end = 1/2" diameter, Large end = 3/4" diameter.
From Amazon: BUY NOW Disk Magnets for Simple Motor
Foil Runner Motor assembly diagram:
Self-Propelled Homopolar Motor on Aluminum Foil Racetrack: A favorite DIY physics toy where disk shaped neodymium magnets supply the static magnetic field for this motor and become the wheels of a very simple vehicle with an AAA battery as the energy source. As soon as both ends make contact with the conducting aluminium foil an electric current will flow which in turn induces a magnetic field underneath the battery assembly. This induced field will then interact with the neodymium magnets on each end causing them to spin- a wonderful example of a motor with minimal components. The racetrack is a cardboard circle from a pizza box covered in kitchen foil.
Feel Flux-- available as a set, or individually (all come with the super powerful sphere magnet) here:
From feelflux.com: BUY NOW: Copper Feel Flux
Get some magnetic viewing film here:
From Amazon: BUY NOW: Color Magnetic Viewing Film
From Educational Innovations: BUY NOW Regular Magnetic Viewing Film
Lenz's Law: a strong Feel Flux neodymium magnet falls slowly down a thick walled copper tube as though passing through a viscous liquid. Since magnetic fields pass through copper, magneview film reveals the location of the falling dipole magnet. The moving magnetic field from the falling magnet produces electric currents in the copper- these currents then produce magnetic fields that have the opposite polarity to the initial field. So a falling magnet makes the copper pipe briefly into an electromagnet that then repels the falling magnet. Swipe to see the magnetic viewing film in detail. Special thanks to the guys from Feel Flux who kindly sent me this awesome longer piece of the copper tube from which their amazing toy is produced.
Get this fun lamp here (comes with both Mini-Moon and silver sphere magnet):
From Amazon: BUY NOW: Levitation Lamp
Levitating Mini Moon Lamp: tapping the floating illuminated Moon turns this LED lamp off and on in this strange design. The Moon with embedded magnet floats a couple centimeters from the surface of the base when plugged in, and feels springy to the touch. Within the base is a control system with adjustable electromagnet coils in a feedback loop with Hall effect sensors which allow for fine tuning of a magnetic field to precisely balance the pull of gravity on the tiny Moon.
Available for under $100 US:
From eBay: BUY NOW
Magnetic Suspension Lamp (Helical filament versions found here)
From Amazon: BUY NOW
Magnetic Suspension Lamp
Magnetic Suspension Lamp: not only does this lamp defy gravity, the LEDs in the bulb are powered through wireless induction (no batteries needed). This kind of levitation uses a control system with an adjustable electromagnet in a feedback loop with Hall effect sensors which allows for fine tuning of the magnetic field to exactly balance the pull of gravity. If this lamp design is unplugged (or the power goes off) the bulb assembly does not fall, but instead snaps onto the upper armature via strong permanent magnets embedded within. Amazing physics demonstrated by clever engineering!
This very high-tech clock is also high end (more expensive than most items I feature), with excellent craftmaship and technology that is clearly hard to replicate so that it is only made by, and available from, the FLYTE team:
From Art of Play: BUY NOW: Story Clock
From FLYTE: BUY NOW: US & Global Sales Story Clock or in EU Story Clock
STORY Clock: a spherical magnet hovers one centimeter from the face of this amazing clock and orbits in a circle to indicate the time- for this video I selected an orbit period of 40 seconds to show off the motion. The orbit of the magnetic ball can be set to any period but also has default selectable presets to indicate the current hour, minute, or second. This kind of levitation uses a control system with adjustable electromagnet coils in a feedback loop with Hall effect sensors which allow for fine tuning of a magnetic field to precisely balance the pull of gravity. Amazing magnetic levitation physics demonstrated by clever engineering by the @flyte.se team, this clock will work lying flat or hung on a wall vertically!
Get this device for a great price here:
From EngineDIY: BUY NOW: Vertical Mendocino Motor
From engineDIY: BUY NOW Horizontal Levitating Motor (on all models here-remove brown protective film to reveal clear acrylic on rotor)
Mendocino Motor: vertical and horizontal versions- each face of a solar cell is connected to a coil of copper wire across from the opposing solar cell. When the rotor is lit from one side the lit solar cell provides electric current to the coil in the opposite position which becomes a temporary electromagnet that pushes against the permanent magnets in the base propelling the rotor to rotate. As the rotor turns, the coil that moves into the position near the magnet is likewise energized by the solar cell currently at the top- one can say the light commutates this motor. Magnetic bearings to reduce friction in both models. Invented in the 1960s by Daryl Chapin of Bell Labs and popularized by Larry Springs of Mendocino CA
Only made by the Flyte team:
From Art of Play: Buda Ball
Buda Ball: a spherical magnet is pinned 1.5 centimeters from the surface of its hardwood base. Within the base is an innovative control system with adjustable electromagnet coils in a feedback loop with Hall effect sensors which allow for fine tuning of a magnetic field to precisely balance the pull of gravity- even when the base is in a vertical orientation! Amazing magnetic levitation physics demonstrated with aesthetic design (and very clever engineering) by the Flyte team- the only (non-superconducting) system I know of that can suspend in a horizontal direction as shown in this video.
Get one from these fine sources:
From Amazon: BUY NOW Magnetic Hourglass
Magnetic Sand Hourglass: ferromagnetic sand collects above a neodymium magnet in the wood base. Each particulate of ferromagnetic iron becomes a temporary dipole magnet in the presence of the magnetic field in the base. The tiny dipoles link up north ends to south ends, creating interesting patterns that reveal the magnetic field lines.
Available in limited supplies here:
From Etsy: BUY NOW: Thermomotor Candle Engine
Thermomotor Carousel: this decorative and dynamic centerpiece is actually a Curie point heat engine! Two tea light candles continually chase two magnets around a magnetic ring in this truly unique design by @violet__revolution. When the portion of the magnetic ring over the flame heats up to a particular temperature (the Curie point) its magnetic field is temporarily lost until it cools, so the magnet near the candle is now pulled toward a cooler portion of the ring- which then heats up and the process continuously repeats creating the steady rotation. Swipe to see the full design (complete with a laser cut forest mantle) in operation. Many thanks to artist and inventor Darragh Hewat for this fantastic addition to my collection.
Get this device here:
From Etsy: BUY NOW: Precision Fidget Devices
Precision Machined Haptic Fidget: four identical stainless steel components precision manufactured to 15µm tolerances via wire EDM (electrical discharge machined) and embedded with magnets to produce a stepped locking mechanism for a haptic sensory experience. The rainbow finish is due to a very thin layer of oxidized titanium produced by a process called physical vapor deposition (PVD) where a molecule thin coating is created under vacuum. So much interesting physics in the many production methods used to make this everyday carry fidget.
This device and similar ones available here:
From Amazon: BUY NOW Magnetic Field Demonstrator Kits
Iron Filing Field Detector: visualizing the invisible- the magnetic field lines around a dipole bar magnet. In the presence of a magnetic field, ferromagnetic materials (such as iron) temporarily become magnets. Here the iron filings become dipole magnets and link up and align like tiny compass needles to follow and reveal the magnetic field lines associated with the permanent magnet underneath. Viscous silicone oil temporarily keeps the iron particles suspended yet allows for rotation and repositioning under the influence of the magnetic field.
Get this amazing (and affordable) reproduction here:
From engineDIY: BUY NOW: Tesla's Egg of Columbus
This version comes with a 35mm solid aluminum sphere.
Get the aluminum phiTOP "egg" here: BUY NOW phiTOP
Tesla’s Egg of Columbus: an aluminum ellipsoid egg (PhiTOP) mysteriously spins and stands upright in this modern version of Tesla’s famous demonstration from the 1893 World’s Fair in Chicago that first showcased the principles behind wireless power transfer and his AC induction motor. The base has no moving parts- instead special copper windings (very similar to Tesla’s original design) form four electromagnet coils on a circular steel core, and a special circuit supplies each with AC currents in such a way that a rotating magnetic field is created. This rotating magnetic field from the coils under the concave glass induces electric eddy currents to flow in the aluminum ellipsoid- these currents then create their own magnetic field which oppose the initial fields underneath and pushes the ellipsoid to spin. Finally, the ellipsoid top stands up vertically (when spun with sufficient rotational velocity) due to physics similar to that of the tippe-top.
Get this inexpensive SomaCube here:
From Amazon: BUY NOW: Magnetic Soma Cube
Magnetic Soma Cube: a new fun variant of the famous math toy invented by Danish scientist and artist Piet Hein, who claimed that this puzzle came to him as he was listening to a lecture on Quantum Mechanics by Werner Heisenberg (yes- that Heisenberg). The seven pieces of this puzzle are all the ways 3 or 4 cubes can be joined such that the piece has at least one inside corner. In this version small magnets are encased in cleverly designed cavities such that they will always flip over to attract a counterpart in another puzzle piece, allowing the puzzle to stick together- or hang from the side of the refrigerator. Amazingly there are 240 ways to make the cube from these 7 pieces- still not that easy!