NCTI INSTALLER TECHNICIAN. CH. 2 QUESTIONS
What would happen if you suspended magnetite by a string and allowed it to swing
freely? - Answer -Magnetite will always align itself in a north and south direction when
you suspend it by a string and allow it to swing freely.
What do scientists believe causes magnetism? - Answer -Scientists believe that
magnetism results from the spinning action of each electron on its own axis and orbiting
around its own nucleus.
Why are some materials magnetic and others not? - Answer -An atom of magnetic
material has more electrons spinning in one direction than in the other; nonmagnetic
material has an equal number of electrons spinning in opposite directions.
Describe the pattern arrangement of the magnetic domains in nonmagnetized and
magnetized materials. - Answer -The magnetic domains in a nonmagnetized material
arrange in a random pattern, which causes the effects to cancel, resulting in no
magnetic field. Those in a magnetized material align in the same direction, which
causes their magnetic fields to add, making the material magnetized.
Describe two methods for creating a magnet. - Answer -Two methods for creating a
magnet include: (1) stroking a magnetic metal with a magnet; and (2) wrapping wire
around a magnetic metal and passing electric current through the wire.
Explain the law of attraction and repulsion between two magnets. - Answer -The law of
attraction and repulsion between two magnets states that like magnetic poles repel
each other, while unlike magnetic poles attract each other.
Describe two methods for demagnetizing a magnet. - Answer -Two methods for
demagnetizing a magnet are vibration and heat.
List the five basic rules that magnetic flux lines follow. - Answer -The five basic rules
that magnetic flux lines follow are: (1) they have direction or polarity; (2) they always
form complete loops; (3) they cannot cross one another; (4) they tend to form the
smallest possible loops; (5) they can pass through magnetic and nonmagnetic
materials.
What would happen if you suspended magnetite by a string and allowed it to swing
freely? - Answer -Magnetite will always align itself in a north and south direction when
you suspend it by a string and allow it to swing freely.
What do scientists believe causes magnetism? - Answer -Scientists believe that
magnetism results from the spinning action of each electron on its own axis and orbiting
around its own nucleus.
Why are some materials magnetic and others not? - Answer -An atom of magnetic
material has more electrons spinning in one direction than in the other; nonmagnetic
material has an equal number of electrons spinning in opposite directions.
Describe the pattern arrangement of the magnetic domains in nonmagnetized and
magnetized materials. - Answer -The magnetic domains in a nonmagnetized material
arrange in a random pattern, which causes the effects to cancel, resulting in no
magnetic field. Those in a magnetized material align in the same direction, which
causes their magnetic fields to add, making the material magnetized.
Describe two methods for creating a magnet. - Answer -Two methods for creating a
magnet include: (1) stroking a magnetic metal with a magnet; and (2) wrapping wire
around a magnetic metal and passing electric current through the wire.
Explain the law of attraction and repulsion between two magnets. - Answer -The law of
attraction and repulsion between two magnets states that like magnetic poles repel
each other, while unlike magnetic poles attract each other.
Describe two methods for demagnetizing a magnet. - Answer -Two methods for
demagnetizing a magnet are vibration and heat.
List the five basic rules that magnetic flux lines follow. - Answer -The five basic rules
that magnetic flux lines follow are: (1) they have direction or polarity; (2) they always
form complete loops; (3) they cannot cross one another; (4) they tend to form the
smallest possible loops; (5) they can pass through magnetic and nonmagnetic
materials.
