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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
Electromagnetic induction
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
faraday’s law
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 induced in the loop
generator
an electromagnetic induction device that produces electric current by rotating a coil within a stationary magnetic field - a generator converts mechanical energy to electrical energy
magnetic domains
clustered regions of aligned magnetic atoms - when these regions are aligned with one another, the substance containing them is a magnet
magnetic field
the region of magnetic influence around either a magnetic pole or a moving charged particle
magnetic force
1) between magents, it is 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, it is a deflecting force due to the motion of the particle - it is perpendicular to the velocity of the particle and perpendicular to the magnetic field lines - also, it is greatest when the particle moves perpendicular to the field lines and zero when the particle moves parallel to the field lines
maxwell’s counterpart to 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
motor
a device employing a current-carrying coil that is forced to rotate in a magnetic field - a motor converts electrical energy to mechanical energy
Note
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