( magnetic fields)
A magnetic field is an area around a magnet, or something functioning as a magnet, in which the magnet’s power to attract things is felt.
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( magnetic fields)
A magnetic field is an area around a magnet, or something functioning as a magnet, in which the magnet’s power to attract things is felt.
N-COUNT
Collins COBUILD Advanced Learner's English Dictionary. Английский словарь Коллинз COBUILD для изучающих язык на продвинутом уровне. 2006