A magnetic field is invisible, but it can be detected using a magnetic compass. A compass contains a small bar magnet on a pivot so that it can rotate. The compass needle points in the direction ...

Here’s a great magnetic levitator build ... That measurement is compared to a second detector mounted slightly lower. The circuit adjusts the electromagnetic field, making sure the object ...

Electrets produce a semi-permanent static electric field, similar to how a magnet produces a magnetic field ... He built a simple electric field detector, which is just a battery, LED and FET ...

The turtles rely on Earth’s magnetic field to help them navigate in two ... When a powerful neutrino traveled through the partly finished ARCA detector off the coast of Italy, it set off sensors ...