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Neodymium Magnet: A magnet material providing 7.5 times the magnetic strength of standard magnetic materials.

Neodymium: A material used in some speaker magnets. Neodymium magnets are smaller and more powerful than conventional speaker magnets.

Magnetic Reversal: A change in the polarity of Earth's magnetic field in which the north magnetic pole becomes the south magnetic pole and vice versa. Also known as geomagnetic reversal or polarity reversal. E . . . View Full Definition

Magnetic Stratigraphy: The study and correlation of polarity epochs and events in the history of the Earth's magnetic field as contained in magnetic rocks.

Magnetic Tape: A ribbon of plastic with a coating on it that is sensitive to magnetic impulses created by electricity. In analog technology, these magnetic impulses are modulated on the tape in a fashion p . . . View Full Definition

Magnetic Resonance Imaging (MRI): Medical imaging technique (like X-rays and ultrasound) allowing physicians to see images of tissues. It is often used to examine the brain or spine.

Magnetic Quantum Number: Quantum number that labels different orbitals within a subshell. Mell can take on values from -ell to +ell. The number of orbitals in a subshell is the same as the number of possible mell values.

Magnetic North: The direction that a compass points. The location where Earth's magnetic field dips vertically into the Earth.

Magnetic North Pole: (1) The point where the Earth's surface intersects the axis of the dipole that best approximates the Earth's field. (2) The point where the Earth's magnetic field dips vertically downward.

Magnetic Polarity: It is a fundamental principle of a winding that adjacent poles must be wound to give opposite magnetic polarity. This does not mean that the coils actually have to be wound in this direction . . . View Full Definition