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This model truncates at degree 12 (168 coefficients) with an approximate spatial resolution of 3,000 kilometers. It is the model used by the United States Department of Defense , the Ministry of Defence (United Kingdom) , the United States Federal Aviation Administration (FAA), the North Atlantic Treaty Organization (NATO), and the ...
By analogy with Earth's magnetic field, these are called the magnet's "north" and "south" poles. Before magnetism was well understood, the north-seeking pole of a magnet was defined to have the north designation, according to their use in early compasses. However, opposite poles attract, which means that as a physical magnet, the magnetic north ...
Continuous charge distribution. The volume charge density ρ is the amount of charge per unit volume (cube), surface charge density σ is amount per unit surface area (circle) with outward unit normal nĚ‚, d is the dipole moment between two point charges, the volume density of these is the polarization density P.
Two pairs of gauge transformed potentials (φ, A) and (φ′, A′) are called gauge equivalent, and the freedom to select any pair of potentials in its gauge equivalence class is called gauge freedom. Again by the Poincaré lemma (and under its assumptions), gauge freedom is the only source of indeterminacy, so the field formulation is ...
Two men faced arraignment Monday in Boston, accused of conducting a "hazardous drone operation" too close to Logan International Airport as concerns over airspace safety and national security ...
Jefimenko says, "...neither Maxwell's equations nor their solutions indicate an existence of causal links between electric and magnetic fields. Therefore, we must conclude that an electromagnetic field is a dual entity always having an electric and a magnetic component simultaneously created by their common sources: time-variable electric ...
From August 2012 to December 2012, if you bought shares in companies when Linda P. Hudson joined the board, and sold them when she left, you would have a 60.8 percent return on your investment, compared to a 3.7 percent return from the S&P 500.
American Airlines is no longer resuming its daily service out of Miami into Port-au-Prince's Toussaint Louverture International Airport.