The figure below shows an experimental device called the "disk of Arago" which was created in 1824 by Franagois Jean Dominique Arago (1786-1853). When a copper disk that looks like (a) underneath the magnet rotates, the magnet follows. However, when the original plate is divided into narrow bands with multiple radii, such as (b), the magnet does not turn along. (1) Why does a magnet rotate along a disk that looks like (a)? (2) Why does a magnet not spin along with a disk that looks like (a)?
The figure below shows an experimental device called the "disk of Arago" which was created in 1824 by Franagois Jean Dominique Arago (1786-1853). When a copper disk that looks like (a) underneath the magnet rotates, the magnet follows. However, when the original plate is divided into narrow bands with multiple radii, such as (b), the magnet does not turn along. (1) Why does a magnet rotate along a disk that looks like (a)? (2) Why does a magnet not spin along with a disk that looks like (a)?
Physics for Scientists and Engineers: Foundations and Connections
1st Edition
ISBN:9781133939146
Author:Katz, Debora M.
Publisher:Katz, Debora M.
Chapter30: Magnetic Fields And Forces
Section: Chapter Questions
Problem 4PQ
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The figure below shows an experimental device called the "disk of Arago" which was created in 1824 by Franagois Jean Dominique Arago (1786-1853). When a copper disk that looks like (a) underneath the magnet rotates, the magnet follows. However, when the original plate is divided into narrow bands with multiple radii, such as (b), the magnet does not turn along.
(1) Why does a magnet rotate along a disk that looks like (a)?
(2) Why does a magnet not spin along with a disk that looks like (a)?
Transcribed Image Text:(a)
magnet
Copper disk
(b)
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