Magnets are amazing. Among their many amazing properties, they even seem to break the laws of physics—until you understand the science behind them. At Apex Magnets, we embrace the incredible properties of magnetism and how they impact industries, innovation, and everyday life. Today, to illustrate just that, we’re diving into an experiment that has real-world implications 

The Experiment: A Magnet’s Slow Descent

Have you ever wondered why a magnet falls more slowly through a roll of aluminum foil than through a roll of cardboard? It seems counterintuitive—after all, aluminum is not magnetic. To see this in action, take a small rare earth magnet (handle with care!) and drop it through the hollow core of an aluminum foil roll. Instead of free-falling like it would through a roll of cardboard, it slows down dramatically. The longer the roll, the slower the magnet falls.

The Science Behind the Phenomenon

This effect is caused by electromagnetic induction, a principle discovered in 1831 by the legendary scientist Michael Faraday. When a magnet moves through a conductive material like aluminum, it generates an electric current in the metal. This current, in turn, creates a magnetic field that opposes the magnet’s motion—essentially acting like an invisible brake.

Larger and stronger magnets produce a greater effect, as do thicker and longer aluminum rolls. And if you really want to supercharge this experiment, try cooling the aluminum with liquid nitrogen. The lower temperature decreases electrical resistance, allowing stronger currents to flow, which enhances the braking force even further.

Real-World Applications

Faraday’s discovery laid the foundation for many of the technologies we rely on today:

  • Electric motors & generators: The very principle that slows the magnet also powers motors and generates electricity, driving industries worldwide.
  • Induction cooktops: By inducing currents in cookware, electromagnetic induction provides a faster, more efficient cooking method.
  • Magnetic braking systems: High-speed trains and amusement park rides use eddy currents (the same effect observed in our aluminum foil experiment) for smooth and efficient braking.
  • MRI machines & particle colliders: Supercooled electromagnets, often using liquid helium, allow for advanced medical imaging and cutting-edge physics experiments.

Bringing Innovation to Your Industry

At Apex Magnets, we specialize in high-performance magnets. Whether you’re an educator looking for engaging demonstrations, an engineer designing electromagnetic braking systems, or a manufacturer leveraging magnetic forces for automation, we have the expertise and products to meet your needs.

Ready to harness the power of magnets for your business? Contact us Apex Magnets today!