Download Magnetism

SCI 2201: Concepts in Science
Discussion Topic: Electricity and Magnetism Trefil and Hazen The Sciences Chapter 5
This discussion should help you to:
1. differentiate between objects moved and not moved by a magnet.
2. demonstrate use of compass and explain how it works.
3. make an electromagnet and explain how it works.
4. describe properties of magnets and define "magnetic field".
5. discuss the relationship between electricity and magnetism
6. teach GPS Standards:
S1P2 …magnets attract some things and repel each other.
S3P2 …investigate how magnets affect objects and repel each other.
S5P3 …investigate electricity and magnetism.
Science Literacy Benchmarks (AAAS, 1993, 4.G: Forces of Nature)
By the end of the 2nd grade, students should know that
 Magnets can be used to make some things move without being touched.
By the end of the 5th grade, students should know that
 Without touching them, a magnet pulls on all things made of iron and either
pushes or pulls on other magnets.
 Without touching them, material that has been electrically charged pulls on all
other materials and may either push or pull other charged materials.
By the end of the 8th grade, students should know that
 Electric currents and magnets can exert a force on each other.
By the end of the 12th grade, students should know that
 Electromagnetic forces acting within and between atoms are vastly stronger than
the gravitational forces acting between the atoms. At the atomic level, electric
forces between oppositely charged electrons and protons hold atoms and
molecules together and thus are involved in all chemical reactions. On a larger
scale, these forces hold solid and liquid materials together and act between objects
when they are in contact—as in sticking or sliding friction.
 Magnetic forces are very closely related to electric forces and can be thought of as
different aspects of a single electromagnetic force. Moving electric charges
produce magnetic forces and moving magnets produce electric forces. The
interplay of electric and magnetic forces is the basis for electric motors,
generators, and many other modern technologies, including the production of
electromagnetic waves.