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  2. Worksheet - Wikipedia

    en.wikipedia.org/wiki/Worksheet

    The form comes with two worksheets, one to calculate exemptions, and another to calculate the effects of other income (second job, spouse's job). The bottom number in each worksheet is used to fill out two if the lines in the main W4 form. The main form is filed with the employer, and the worksheets are discarded or held by the employee.

  3. Magmatism - Wikipedia

    en.wikipedia.org/wiki/Magmatism

    Magmatism is the emplacement of magma within and at the surface of the outer layers of a terrestrial planet, which solidifies as igneous rocks.It does so through magmatic activity or igneous activity, the production, intrusion and extrusion of magma or lava.

  4. Thermoremanent magnetization - Wikipedia

    en.wikipedia.org/wiki/Thermoremanent_magnetization

    While quenching it was oriented in the Earth's field to get the desired polarity. In 1600, William Gilbert published De Magnete (1600), a report of a series of meticulous experiments in magnetism. In it, he described the quenching of a steel rod in the direction of the Earth's field, and he may have been aware of the Chinese work.

  5. Fundamental interaction - Wikipedia

    en.wikipedia.org/wiki/Fundamental_interaction

    [8] In 1873, James Clerk Maxwell unified electricity and magnetism as effects of an electromagnetic field whose third consequence was light, travelling at constant speed in vacuum. If his electromagnetic field theory held true in all inertial frames of reference , this would contradict Newton's theory of motion, which relied on Galilean ...

  6. Micromagnetics - Wikipedia

    en.wikipedia.org/wiki/Micromagnetics

    Micromagnetics is a field of physics dealing with the prediction of magnetic behaviors at sub-micrometer length scales. The length scales considered are large enough for the atomic structure of the material to be ignored (the continuum approximation), yet small enough to resolve magnetic structures such as domain walls or vortices.

  7. Classical electromagnetism - Wikipedia

    en.wikipedia.org/wiki/Classical_electromagnetism

    Classical electromagnetism or classical electrodynamics is a branch of physics focused on the study of interactions between electric charges and currents using an extension of the classical Newtonian model.

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