Below, a Hall Effect sensor rests atop an electromagnet — 1″ in diameter, with 6/8″ wire coiled around another bolt. As the pendulum’s magnet accelerates towards the electromagnet’s core ...

The iron core increases the coil’s magnetic field strength. A simple electromagnet is made by coiling wire around an iron nail. An iron core makes a temporary electromagnet. It loses its ...

It is a common grade school experiment to wind some wire around a screw ... school science to show that neither an electromagnet nor a permanent magnet will pick up nonferrous items like copper ...