Individual letters of the display are actuated by a matrix of magnetic coils on custom PCBs. These work in a vaguely similar fashion to LED matrices, except they generate magnetic fields that can ...

[Stephen Hobley] has been experimenting with an electromagnetic pendulum in order ... easiest way to keep the pendulum moving was to use a coil to detect when the it reached the equilibrium ...

THE electromagnet designed for the use of oculists ... and its dimensions must bear the proper reIation to those of the coil. The first condition is very important. The small electromagnets ...

Increasing the number of turns on the coil of wire The image below illustrates a simple experiment to demonstrate electromagnetic induction. The direction of a motor effect force can be found ...