# An Etymological Dictionary of Astronomy and AstrophysicsEnglish-French-Persian

## فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

### M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 11 Search : induction
 electromagnetic induction   درهازش ِ برقامغناتی   darhâzeš-e barqâmeqnâtiFr.: induction électromagnétique   The production of an → electromotive force in a circuit caused by a variation in the magnetic flux through the circuit. If this variation is produced by a change in the current flowing in the circuit itself, it is called → self-induction. If due to the variation in a current in some other circuit, it is called mutual induction. See also → Faraday's law of induction. electrostatic induction   درهازش ِ برق‌ایستا   darhâzeš-e barqistâFr.: induction électrostatique   The production of stationary electric charges on an uncharged object as a result of a charged body being brought near it without touching it. A positive charge will induce a negative charge, and vice versa. Faraday's law of induction   قانون ِ درهازش ِ فارادی   qânun-e darhazeš-e FaradayFr.: loi d'induction de Faraday   The induced → electromotive force in a circuit is equal in magnitude and opposite in sign to the rate of change of the → magnetic flux through the surface bounded by the circuit. Mathematically, it is expressed as: ∇ x E = -∂B/∂t, which is one of the four → Maxwell's equations.→ farad; → law; → induction. induction   درهازش   darhâzešFr.: induction   1) General: The act of inducing, bringing about, or causing. 2) Electromagnetism: A common term for the process by which a body having electric or magnetic properties produces magnetism, an electric charge, or an → electromotive force in a neighboring body without contact. For more details, see → electromagnetic induction; → electrostatic induction; → magnetic induction. 3) Math.: A method of mathematical proof typically used to establish that a given statement is true of all natural numbers. It is done by proving that the first statement in the infinite sequence of statements is true, and then proving that if any one statement in the infinite sequence of statements is true, then so is the next one. 4) Logic: Any form of reasoning in which the conclusion, though supported by the premises, does not follow from them necessarily. → inductive reasoning.Verbal noun of → induce. induction coil   پیچه‌ی ِ درهازش   pice-ye darhâzešFr.: bobine d'induction   A device for producing high-voltage pulses by means of → electromagnetic induction. It consists of a primary coil of a few turns of wire, wound on an iron core, and insulated from a secondary coil of many turns which surrounds it coaxially. The current in the primary, which is interrupted periodically, sets up a magnetic field, first big, then zero. This changing field induces a large voltage in the secondary.→ induction; → coil. induction equation   هموگش ِ درهازش   hamugeš-e darhâzešFr.: équation d'induction   In magnetohydrodynamics, an equation that describes the transport of plasma and magnetic field lines over time: ∂B/∂t = ∇ x (v x B) + η∇2B, where B is the → magnetic induction, v is the plasma velocity, and η = (μσ)-1 the → magnetic diffusivity. The first term on the right side represents → magnetic advection and the second term → magnetic diffusion. The induction equation can also be expressed as: ∂B/∂t = -(v.∇)B + (B.∇)v - B(∇.v), where the terms of the right-hand side stand for advection, stretching, and compression, respectively. Among these terms, net increase of the field can be done only through the stretching and compression.→ induction; → equation. induction field   میدان ِ درهازش   meydân-e darhâzešFr.: champ d'induction   A component of an electromagnetic field which is the region close to the source (an antenna) where steady-state magnetic and electrostatic forces can be detected. → radiation field.→ induction; → field. line of induction   خط ِ درهازش   xatt-e darhâzešFr.: ligne d'induction   Same as → line of force in a magnetic field.→ line; → induction. magnetic induction   درهازش ِ مغناتیسی   darhâzeš-e meqnâtisiFr.: induction magnétique   1) Same as → magnetic flux density. 2) The production of a magnetic field in a piece of un-magnetized iron or other → ferromagnetic substance when a magnet is brought near it. The magnet causes the individual particles of iron, which act like tiny magnets, to line up so that the sample as a whole becomes magnetized.→ magnetic; → induction. saturation induction   درهازش ِ انجال، ~ انجالش   darhâzeš-e anjâl, ~ anjâlešFr.: induction à saturation   The maximum intrinsic magnetic induction possible in a material.→ saturation; → induction. self-induction   خود-درهازش   xod-darhâzešFr.: auto-induction   The generation of a voltage in a circuit due to self-inductance, the polarity of which tends to oppose the changing current in the circuit.→ self-; → induction.