chapter 9 magnetism terms

Flashcard maker : Lily Taylor
Magnetic force
(1) between magnets, the attraction of unlike magnetic poles for each other and the repulsion between like magnetic poles (2) between a magnetic field and a moving charged particle, a deflecting force due to the motion of the particle
Magnetic fields
the region of magnetic influence around either a magnetic pole or a moving charged particle
Magnetic domains
clustered regions of aligned magnetic atoms. When these regions are aligned with one another, the substance containing them is a magnet
Electromagnet
a magnet whose field is produced by an electric current. Electromagnets are usually in the form of a wire coil with a piece of iron inside the coil
Electric motor
a device that uses a current-carrying coil forced to rotate in a magnetic field to convert electrical energy to mechanical energy
Electromagnetic induction
the induction of voltage when a magnetic field changes with time. if the magnetic field within a closed loop changes in any way, a voltage is introduced in the loop: voltage induced ~ number of loops X magnetic field change/time. this is a statement of Faraday’s law. The induction of voltage is the result of a more fundamental phenomenon: the induction of an electric field
Faraday’s law
an electric field is induced in any region of space in which a magnetic field is changing with time. The magnitude of the induced electric field is proportional to the rate at which the magnetic field changes. The direction of the induced field is at right angles to the direction of the changing magnetic field
Generator
an electromagnetic induction device that produces electric current by rotating a coil within a stationary magnetic field; converts mechanical energy to electrical energy
Transformer
a device for transferring electric power from one coil of wire to another by means of electromagnetic induction, for the purpose of transforming one value of voltage to another
Maxwell’s counterpart to Faraday’s law
a magnetic field is induced in any region of space in which an electric field is changing with time. The magnitude of the induced magnetic field is proportional to the rate at which the electric field changes. The direction of the induced magnetic field is at the right angle to the changing electric field

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