* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download 5H10.11 - Compass Needles and Magnet
Magnetosphere of Saturn wikipedia , lookup
Maxwell's equations wikipedia , lookup
Friction-plate electromagnetic couplings wikipedia , lookup
Geomagnetic storm wikipedia , lookup
Edward Sabine wikipedia , lookup
Magnetic stripe card wikipedia , lookup
Neutron magnetic moment wikipedia , lookup
Mathematical descriptions of the electromagnetic field wikipedia , lookup
Lorentz force wikipedia , lookup
Electromagnetism wikipedia , lookup
Giant magnetoresistance wikipedia , lookup
Magnetometer wikipedia , lookup
Magnetic monopole wikipedia , lookup
Magnetic field wikipedia , lookup
Magnetotactic bacteria wikipedia , lookup
Earth's magnetic field wikipedia , lookup
Multiferroics wikipedia , lookup
Electromagnetic field wikipedia , lookup
Magnetotellurics wikipedia , lookup
Magnetochemistry wikipedia , lookup
Magnetohydrodynamics wikipedia , lookup
Electromagnet wikipedia , lookup
Magnetoreception wikipedia , lookup
Faraday paradox wikipedia , lookup
Eddy current wikipedia , lookup
Superconducting magnet wikipedia , lookup
Force between magnets wikipedia , lookup
COMPASS NEEDLES AND MAGNET Electricity and Magnetism 5H10.11 Magnetic Fields and Forces Magnetic Fields Concept: Equipment: This demonstration reveals the key characteristics of the field lines of a permanent magnet: • Compass Array Board • Small Bar Magnet • There are (to date) no magnetic monopoles, only dipoles and • combinations of dipoles. Hence, the field lines must begin and end at opposite poles. The B-field vectors are tangent to the lines at all points. • The density of field lines is proportional to the magnetic field strength in that region. • Field lines never cross themselves (otherwise the field would have an ambiguous direction at the crossings). Overhead Projector (if not in classroom) Procedure: 1. Place the compass array board on the overhead projector or document camera. 2. Notice the magnetic domains formed by tiny magnets in the compass array (as shown in the top-right picture). 3. Place the small bar magnet vertically on the compass array board. 4. Notice the direction and shape of the magnetic field for each of the magnet’s poles. 5. Place the small bar magnet horizontally on the compass array board. 6. Notice the direction and shape of the magnetic field lines for the entire bar magnet. UCI PHYSICS AND ASTRONOMY Lecture Demonstration Program Updated 7/27/09