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The Barkhausen Effect EM-g2c
Clicking noises are heard when a magnet is brought near iron wire within a pickup coil. Fishbane Chapter:   32.3 HRW 9th:   32.11 Reese Chapter:   20.912 SJ 3rd Chapter:   22.911 PIRA DCS classification:   5G20.10

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Physics Lecture Demonstrations at the Department of Physics and Astronomy
The Johns Hopkins University