* PHYSICS – Magnetism
* What is a magnetic domain?
-Large group (billions) of electrons that are spinning the same direction, aren’t paired up. Super imposed upon one another, forms a domain.
* Permanent Magnet- one that does not need an electric current running through it, can act on its own.
* On a micro level, what is the difference between a non-magnetized nail and a magnetized nail?
-same magnetic field alignment, caused by multiple charges that are moving the same way
* Why drop the magnet?
Demagnetizes it, breaks up the clusters of domains.
* Why does a piece of iron in a current-carrying loop increase the magnetic field strength?
induced charge?
* Supermagnetic = no resistance
* Maximum deflecting force= when force is perpendicular
minimum deflecting force = when force is parallel
* What effect does earth’s magnetic have on the intensity of cosmic rays striking earth’s surface?
Northern lights.. Cosmic rays being deflected by earth’s magnetic fields.. Particle belts
* Galvanometer is a electric meter that can be calibrated to measure many things (volts, amps, ohms)
-one magnet can be made to find changes in another magnet.. when current runs through it causes a movement in charge which causes a magnetic field
* Earth’s Magnetic Field
* What is meant by magnetic declination?
* How much true North is off from magnetic North
* Why are there probably no permanently alighned magnetic domains in Earth’s core?
* Probably because the molten iron (other materials) keep moving around
* Cause of “Northern Lights”?
* Trapping of charged particles in Earth’s magnetic field (they come from the sun)
* Other creatures that have internal magnets
* Birds
* Nanobacteria
* Lobsters
* People
* Electromagnetic Reaction
* What did Michael Faraday and Joseph Henry discover?
*...
No comments