Magnets are surprisingly versatile tools for projects, household tasks, and hands-on science. Whether you have a handful of neodymium magnets from an old hard drive or a fresh pack from a hobby shop, there’s no shortage of practical and creative ways to put them to work. Here’s a rundown of the best uses, from everyday household hacks to weekend projects.
Build a Simple Electric Motor
One of the most satisfying magnet projects takes about five minutes and requires only three things: a small neodymium magnet, a AA battery, and a piece of solid copper wire. Attach the magnet to the negative (flat) end of the battery, then place a washer on the magnet to act as a base so the battery can stand upright. Bend the copper wire into an M-shape with curved arches on both sides of a sharp center point. The center bend balances on top of the battery’s positive terminal, and the curved ends just barely touch the sides of the magnet at the bottom.
When the wire makes contact with both the battery terminal and the magnet, current flows through the copper and interacts with the magnet’s field, causing the wire to spin. It’s called a homopolar motor, and it’s one of the simplest demonstrations of how electric motors convert electrical energy into motion. Kids and adults find it equally mesmerizing.
Make Magnetic Slime
Magnetic slime reacts to a magnet held nearby, stretching and crawling toward it as if it’s alive. You need half a cup of washable school glue, half a cup of water, half a teaspoon of baking soda, two tablespoons of contact lens solution (the kind containing both boric acid and sodium borate), and at least one tablespoon of iron filings.
Mix the glue and water first, stir in the baking soda, then add the contact lens solution and stir vigorously until the mixture pulls away from the sides of the bowl. Sprinkle the iron filings onto the slime and knead until the color is uniform throughout. Hold a strong magnet close to the finished slime and watch it reach out and follow the magnet’s pull. The iron filings embedded in the slime align with the magnetic field, making the whole blob respond to nearby magnets.
Mount a Magnetic Knife Strip
A magnetic knife strip frees up counter and drawer space while keeping your blades visible and easy to grab. The key to a good installation is height. Mount it roughly 10 to 15 inches above the countertop, which puts knife handles at about chest height for most people. That range keeps the strip above small appliances and pot handles without forcing you to reach uncomfortably high.
If anything tall like a blender sits below the strip’s location, mount it high enough to clear that appliance so nothing bumps the blades when you slide things around. Place knives with the tips pointing upward. If a knife ever slips off, it falls handle-first, which is significantly safer. In homes with small children, mounting the strip well above counter height or inside a cabinet adds an extra layer of protection.
Find Studs Without a Battery-Powered Scanner
A strong rare earth magnet works as a dead-simple stud finder. Slowly slide it across drywall and it will grab onto the screws or nails securing the drywall to the stud beneath. A neodymium magnet can detect metal up to one inch behind standard half-inch drywall, which covers the vast majority of residential walls.
This method has a real advantage over electronic stud finders: it pinpoints the exact location of a fastener rather than estimating the stud’s edges. Once the magnet sticks, you know a stud runs vertically through that spot. Leave the magnet on the wall as a marker while you grab your drill. For hanging shelves, TVs, or heavy frames, this trick is fast, free, and more reliable than many budget electronic scanners.
Clean an Aquarium Without Getting Wet
Magnetic aquarium cleaners use a pair of magnets, one with a scrubbing pad that goes inside the tank and one with a handle that stays on the outside. Move the outer magnet and the inner scrubber follows, wiping algae off the glass without putting your hands in the water. The right size depends on your tank’s glass thickness. For tanks with glass up to a quarter inch thick (typically 25 gallons or smaller), a nano-sized cleaner works. Tanks with glass between a quarter inch and half an inch need a standard model, and thick glass up to one inch requires a max-strength version. Curved bowfront tanks need a cleaner rated one size up because the curved glass creates a slightly larger gap between the magnet halves.
Build a Magnetic Levitation Display
Electromagnetic levitation looks like magic, but the concept is straightforward. A sensor detects the position of a floating magnetic object, and a controller adjusts the current flowing through an electromagnet coil to keep the object suspended. When the object drifts too close, the system reduces the pull. When it drops too far, the system increases it.
The core components are a coil of wire (the electromagnet), a position sensor that reads how close the floating object is, a controller chip that makes rapid adjustments, and a motor driver that translates the controller’s signals into the right amount of current. Kits designed for this project package everything together and typically levitate a small magnet or a lightweight object with a magnet embedded in it. The result is a floating display that works well for showing off small items. It’s a more advanced weekend project, but the payoff is a genuinely impressive desk piece.
Organize Your Workshop and Garage
Strong magnets excel at corralling small metal items that otherwise end up scattered across a workbench. Stick a magnet to the side of a toolbox to hold screwdriver bits, socket extensions, or loose screws while you work. Mount a magnetic strip inside a cabinet door for wrenches, pliers, or any tool with a steel component. Rare earth magnets attached to the underside of a shelf can suspend jars with metal lids, keeping small hardware like nails, washers, and bolts visible and off the bench surface.
For pickup duty, taping a strong magnet to the end of a stick creates a simple sweep tool for collecting dropped screws, staples, or nails from a shop floor or lawn after a roofing project.
Safety Around Magnets
Neodymium magnets are powerful enough to cause real problems if handled carelessly. Two magnets snapping together can pinch skin hard enough to cause blood blisters or worse, and swallowed magnets are a serious medical emergency, especially for children, because multiple magnets can attract through intestinal walls and cause perforations. Keep small magnets away from young kids entirely.
Anyone with a pacemaker or implanted cardiac device should keep neodymium magnets at least six inches away from the device at all times. Strong magnetic fields can interfere with the programming of these implants, potentially switching them into unintended modes. This applies to magnetic jewelry, wristbands, and project magnets alike.
When you’re done with magnets and need to get rid of them, don’t toss them in regular trash where they can stick to sorting equipment at recycling facilities. Many electronics recycling programs accept magnets because they contain recoverable rare earth metals. Earth911’s recycling lookup tool can help you find a drop-off location near you, and many county transfer stations accept them alongside other electronics.