the citadel or high fortified area of an ancient Greek city. the Acropolis, the citadel of Athens and the site of the Parthenon.
Electromagnets are used in a number of everyday devices. One useful characteristic of an electromagnet is the fact that you can vary its magnetic force by changing the amount and direction of the current going through the coils or windings around it.ummary. Electromagnets are used in a number of devices, such as loudspeakers and tape recorders. Some electromagnets can be very strong and its power can be readily turned off and on, such as in junk yard electromagnets and electromagnetic locks.
Applications of electromagnets. The ability of electromagnets [electromagnets: Magnets made by wrapping a coil of wire around an iron bar and passing an electric current through the coil.] to attract magnetic materials (iron, steel, nickel and cobalt) makes them useful in many ways.pplications of electromagnets. The ability of electromagnets [electromagnets: Magnets made by wrapping a coil of wire around an iron bar and passing an electric current through the coil.] to attract magnetic materials (iron, steel, nickel and cobalt) makes them useful in many ways.