Magnetic Needle Onlymagnetic needle. A slender bar of magnetized steel usually suspended on a low friction mounting and used in various instruments, especially in the magnetic compass, to indicate the direction of the earth's magnetic poles.
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magnetic needle. A slender bar of magnetized steel usually suspended on a low-friction mounting andusedin various instruments, especially in themagnetic compass, to indicate the direction of the earth'smagneticpoles.