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Short Description: This activity uses magnetic field sensors with the "Texas Instrument" Graphing Calculator and CBL to measure and plot magnetic fields. This allows the student to prove that magnetic fields decrease as the negative cube of the distance.
Magnetospheres: Planetary Shields
Grade Level: 9-12
Our Solar System,
Earth Science Missions (Earth),
Science Education Standards:
By the end of the 12th grade, students should know that
- At the atomic level, electric forces between electrons and protons in atoms hold molecules together and thus are involved in all chemical reactions. 4G/H2b*
- In many conducting materials, such as metals, some of the electrons are not firmly held by the nuclei of the atoms that make up the material. In these materials, applied electric forces can cause the electrons to move through the material, producing an electric current. In insulating materials, such as glass, the electrons are held more firmly, making it nearly impossible to produce an electric current in those materials. 4G/H4ab*
- Magnetic forces are very closely related to electric forces and are thought of as different aspects of a single electromagnetic force. Moving electrically charged objects produces magnetic forces and moving magnets produces electric forces. 4G/H5ab*
- Electric currents in the earth's interior give the earth an extensive magnetic field, which we detect from the orientation of compass needles. 4G/H7** (SFAA)
National Science Education Standards
Physical Science - Content Standard B
MOTIONS AND FORCES
- The electric force is a universal force that exists between any two charged objects. Opposite charges attract while like charges repel. The strength of the force is proportional to the charges, and, as with gravitation, inversely proportional to the square of the distance between them.
- Between any two charged particles, electric force is vastly greater than the gravitational force. Most observable forces such as those exerted by a coiled spring or friction may be traced to electric forces acting between atoms and molecules.
- Electricity and magnetism are two aspects of a single electromagnetic force. Moving electric charges produce magnetic forces, and moving magnets produce electric forces. These effects help students to understand electric motors and generators.
Source: Rice University