9.1 Magnets and Electricity Flashcards
What is a magnet?
A metal or rock, usually with high iron content. They create invisible magnetic fields of force around themselves that attract other magnets or metals.
Magnetic fields are concentrated around the ends of magnets that are called:
Poles.
Attract or Repel
Identical Poles (North & North/ South & South)
Repel.
Attract or Repel
Opposite Poles (North & South)
Attract.
What is naturally magnetic?
Lodestone.
What metals can become magnetic?
Iron, cobalt and nickel.
What is the process called that makes nonmagnetic metals magnetic?
Magnetization.
What are magnetic domains?
Tiny magnetic crystals inside magnetic materials.
What are domains?
Tiny magnets inside a big magnet.
What happens when you break a magnet in half?
Becuase of the domains each half is a magnet of its own with its own North and South poles.
What is temporary magnetization?
Something becoming weakly magnetic but only when it is in contact with the magnet.
Magnetic fields of attraction and magnetic fields of repulsion look:
Different.
What does MRI stand for?
Magnetic Resonance Imaging.
How do MRIs work?
The paitent is places ina. powerful magnetic field and scanned by radio waves.
MRIs are clearer than X-rays or CT scans. True or false?
True.
