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ERIC Number: EJ912893
Record Type: Journal
Publication Date: 2010-Nov
Pages: 4
Abstractor: As Provided
Reference Count: 6
ISSN: ISSN-0031-921X
Magnetostatics Analysis, Design, and Construction of a Loudspeaker
Galeriu, Calin
Physics Teacher, v48 n8 p537-540 Nov 2010
Making a loudspeaker is a very rewarding hands-on activity that can be used to teach about electro-magnetism and sound waves. Several loudspeaker designs have been described in this magazine. The simplest loudspeaker has only a magnet, a coil, and three plastic cups. The simpler devices require a powerful amplified output, e.g., from a boom box. The more complex devices can operate using the smaller electric current from a CD player earphone output. Unfortunately, the procedure to make a more efficient loudspeaker is lengthy and less recommended to some high school students, involving a hot glue gun, a safety razor, five-minute epoxy, etc. Our loudspeaker, a variation of Heller's, is both simple in construction and efficient in operation. An analysis of the magnetic field distribution helped us in the design of this loudspeaker.
American Association of Physics Teachers. One Physics Ellipse, College Park, MD 20740. Tel: 301-209-3300; Fax: 301-209-0845; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Descriptive
Education Level: High Schools
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A