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  2. Magnetic declination - Wikipedia

    en.wikipedia.org/wiki/Magnetic_declination

    The angle between magnetic and grid meridians is called grid magnetic angle, grid variation, or grivation." [1] By convention, declination is positive when magnetic north is east of true north, and negative when it is to the west. Isogonic lines are lines on the Earth's surface along which the declination has the same constant value, and lines ...

  3. Method of image charges - Wikipedia

    en.wikipedia.org/wiki/Method_of_image_charges

    Method of image charges. The method of image charges (also known as the method of images and method of mirror charges) is a basic problem-solving tool in electrostatics. The name originates from the replacement of certain elements in the original layout with fictitious charges, which replicates the boundary conditions of the problem (see ...

  4. Paradox of radiation of charged particles in a gravitational ...

    en.wikipedia.org/wiki/Paradox_of_radiation_of...

    The paradox of a charge in a gravitational field is an apparent physical paradox in the context of general relativity. A charged particle at rest in a gravitational field, such as on the surface of the Earth, must be supported by a force to prevent it from falling. According to the equivalence principle, it should be indistinguishable from a ...

  5. Thermionic emission - Wikipedia

    en.wikipedia.org/wiki/Thermionic_emission

    Thermionic emission is the liberation of charged particles from a hot electrode whose thermal energy gives some particles enough kinetic energy to escape the material's surface. The particles, sometimes called thermions in early literature, are now known to be ions or electrons.

  6. Play Poker Five Card Draw Online for Free - AOL.com

    www.aol.com/.../poker-five-card-draw

    Poker: Five Card Draw. Make the best five-card combination with an opportunity to draw, while enjoying structured betting. By Masque Publishing. Advertisement.

  7. North magnetic pole - Wikipedia

    en.wikipedia.org/wiki/North_magnetic_pole

    The geomagnetic north pole is the northern antipodal pole of an ideal dipole model of the Earth's magnetic field, which is the most closely fitting model of Earth's actual magnetic field. The north magnetic pole moves over time according to magnetic changes and flux lobe elongation [2] in the Earth's outer core. [3]

  8. Four-current - Wikipedia

    en.wikipedia.org/wiki/Four-current

    Electromagnetism. In special and general relativity, the four-current (technically the four-current density) [1] is the four-dimensional analogue of the current density, with units of charge per unit time per unit area. Also known as vector current, it is used in the geometric context of four-dimensional spacetime, rather than separating time ...

  9. History of the Jews in Iran - Wikipedia

    en.wikipedia.org/wiki/History_of_the_Jews_in_Iran

    The Jew (Originally Juhud (Persian:جهود), a negative term meaning Jew) who is without honor, Is a nuisance from head to toe, He is a lie from toe to head, May scum cover his father's grave, He is an enemy of the religion of Islam, Don't call him a Jew, he is an infidel, His scarf, his gown and his shirt, His property, his children and his ...