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BJU Physical Sci 11

BJU Physical Science - Ch 11

QuestionAnswer
An electrical current that periodically changes direction at a specific frequency. alternating current
The temperature at which a permanent magnet loses its magnetic field. Curie temperature
The natural tendency of all matter to weaken a magnetic field, especially in the absence of other kinds of magnetism. These materials generate a magnetic field that opposes the external magnetic field. diamagnetism
Microscopic regions of materials that may be lined up in a single direction to produce a magnetic field of force. Domains
Electricity generated from a changing magnetic field or a magnetic field generated by an electrical current. electromagnetic induction
A form of magnetism that results from the net difference of a mixture of opposed magnetic dipole particles in a natural magnet, such as a lodestone. ferrimagnetism
The point representing the intersection of the earth’s axis with its surface in the northern hemisphere. All lines of longitude pass through this point. Also called true north. geographic north pole
The SI unit of frequency’ one cycle per second. hertz
A law that says like magnetic poles attract and opposite magnetic poles repel. law of magnetism
Exhibited by materials that are only slightly attracted to magnets. It varies with temperature and does not produce permanent magnets. paramagnetism
An electrical device used in AC circuits consisting of two coils of wire wound on a single ferromagnetic core, usually shaped like a hollow square. It can either raise or lower the voltage in an AC circuit. transformer
The phenomenon observed in materials that are highly permeable to magnetic lines of force because their magnetic domains align with the field, reinforcing it. ferromagnetism
The magnetic field of the earth. geomagnetic field
An object that possesses or can have a magnetic field. magnet
The region of influence surrounding a magnet, where it exerts a magnetic field which is shown by lines of force. magnetic field
The slowly drifting point on the earth’s surface in the northern hemisphere where the earth’s magnetic field lines are most concentrated and nearly vertical as they pass into the earth’s interior; the south magnetic pole of the earth’s geomagnetic field. magnetic North pole
One of two areas of concentrated magnetic field lines on a magnet’s surface. The field direction for each pole is the opposite of the other. magnetic pole
Rule that the direction of the magnetic field surrounding a current-carrying conductor is indicated by the direction the right hand fingers wrap around the conductor, the thumb pointing in the direction of the conventional current flow. right-hand rule of magnetism
Created by: heidio