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.
Observe the number of turns in an electromagnet's coil. A simple electromagnet can be made by wrapping a coil of wire around a nail and attaching its ends to a 1.5-volt battery, while commercial electromagnets have sizable cores of one of the magnet materials described above and large coils around them. You can also use the gaussmeter sensor to test the field strength at varying distances from the magnet. 2  Place the sensor at a series of defined distances from the magnet's pole and record the results. 3  This method would be suitable for teaching middle school and high school age students about magnetic fields.