From Longman Dictionary of Contemporary Englishmagnetic fieldmagˌnetic ˈfield noun [countable] HPEan area around an object that has magnetic power the Earth’s magnetic field
Examples from the Corpus
magnetic field• In the case of the human body, that steady field is the Earth's magnetic field.• In a few rare cases, lava flows on land have taken place just as the magnetic field was undergoing a reversal.• The magnetic field is thus one aspect of the earth that scientists have studied in detail for centuries.• The magnetic field that led to its discovery had vanished at the moment of that radio shriek.• More strikingly, it demonstrated that a toroidal discharge in a toroidal magnetic field established its own stable configuration. 