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- Q420 - Navigation General: Great Lakes and Inland
122. Which term is given to magnetism which is present only when the material is under the influence of an external field?
Induced magnetism exists only when a material is exposed to an external magnetic field and disappears when the field is removed. This contrasts with permanent magnetism, which persists after field removal, terrestrial magnetism, which is Earth's natural field, and residual magnetism, which is a remaining magnetism after field removal.
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