“electromagnetic induction”的概念、定义、翻译、参考文献-科学参考

electromagnetic induction

Physics

The production of an electromotive force in a conductor when there is a change of magnetic flux linkage with the conductor or when there is relative motion of the conductor across a magnetic field. The magnitude of the e.m.f. is proportional (and in modern systems of units equal) to the rate of change of the flux linkage or the rate of cutting flux dΦ‎/dt; the sense of the induced e.m.f. is such that any induced current opposes the change causing the induction, i.e. E=−dΦ‎/dt. Electromagnetic induction was discovered by Michael Faraday in 1831 and independently by Joseph Henry at about the same time. See Faraday’s laws of electromagnetic induction; inductance; Lenz’s law; Neumann’s law.

Electronics and Electrical Engineering

The production of an electromotive force in a conductor when there is a change in magnetic flux through the conductor. The laws of electromagnetism may be expressed as follows.
1. (i) When a moving conductor cuts the flux of a magnetic field or when a changing magnetic field crosses a conductor an induced electromotive force is produced across the conductor.
2. (ii) Faraday–Neumann law (or Faraday’s law): if a conductor cuts a magnetic flux, Φ, the induced potential difference, V, is proportional to the rate of change (dΦ/dt) of flux.
3. (iii) Lenz’s law: the induced potential difference is in such a direction as to oppose the change that produces it:
$V = - \frac{dΦ}{d t}$
If a current in a circuit varies, the associated magnetic flux also changes in direct proportion causing a back e.m.f. This is self-inductance, and the back e.m.f. is given by
$V = - \frac{L d I}{d t}$
where I is the current and L is the coefficient of self-inductance, also called self-inductance, which is measured in henrys.
The change in flux associated with a varying current can also link with another circuit and produce an e.m.f. in it. This is mutual inductance. The induced e.m.f. in a second circuit is given by
$V_{2} = - \frac{M d I_{1}}{d t}$
where M is the coefficient of mutual inductance, also called mutual inductance, which is measured in henrys. In an ideal mutual inductance between two circuits with self-inductance L₁ and L₂,
$M^{2} = L_{1} L_{2}$

单词	electromagnetic induction
释义	electromagnetic induction Physics The production of an electromotive force in a conductor when there is a change of magnetic flux linkage with the conductor or when there is relative motion of the conductor across a magnetic field. The magnitude of the e.m.f. is proportional (and in modern systems of units equal) to the rate of change of the flux linkage or the rate of cutting flux dΦ‎/dt; the sense of the induced e.m.f. is such that any induced current opposes the change causing the induction, i.e. E=−dΦ‎/dt. Electromagnetic induction was discovered by Michael Faraday in 1831 and independently by Joseph Henry at about the same time. See Faraday’s laws of electromagnetic induction; inductance; Lenz’s law; Neumann’s law. Electronics and Electrical Engineering The production of an electromotive force in a conductor when there is a change in magnetic flux through the conductor. The laws of electromagnetism may be expressed as follows. (i) When a moving conductor cuts the flux of a magnetic field or when a changing magnetic field crosses a conductor an induced electromotive force is produced across the conductor. (ii) Faraday–Neumann law (or Faraday’s law): if a conductor cuts a magnetic flux, Φ, the induced potential difference, V, is proportional to the rate of change (dΦ/dt) of flux. (iii) Lenz’s law: the induced potential difference is in such a direction as to oppose the change that produces it: $V = - \frac{dΦ}{d t}$ If a current in a circuit varies, the associated magnetic flux also changes in direct proportion causing a back e.m.f. This is self-inductance, and the back e.m.f. is given by $V = - \frac{L d I}{d t}$ where I is the current and L is the coefficient of self-inductance, also called self-inductance, which is measured in henrys. The change in flux associated with a varying current can also link with another circuit and produce an e.m.f. in it. This is mutual inductance. The induced e.m.f. in a second circuit is given by $V_{2} = - \frac{M d I_{1}}{d t}$ where M is the coefficient of mutual inductance, also called mutual inductance, which is measured in henrys. In an ideal mutual inductance between two circuits with self-inductance L₁ and L₂, $M^{2} = L_{1} L_{2}$
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