Cite a Poem From a Book. EasyBib can help you cite a poem from a book, here's how: 1  Type in the ISBN of your text book (find inside the front of the book).  If more than one book is listed, double check the details and click Select on the correct book.
Without electromagnets, the speakers won't work, that is why they are used. Like asking why an engine is used in an automobile, or blades in a fan. Some speakers do you electrostatics to produce the motion needed to produce sound. billrussell42 Â· 7 years ago. Thumbs up. 1.here is an electromagnet attatched to the diaphragm. When current flows through the coil one way it becomes a magnet. since there is a permanent magnet behind the coil, the coil is pulled toward the magnet.
Electromagnets are used in things that have moving parts, eg. CD players, heads on Hard drives, automatic doors in a grocery store, electric windows, motors etc., Some examp â¦ les include: You can slide the bolts of locks and latches, tap out telegraphic dots and dashes, open and close switches in distant electric circuits.