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Electricity

Taken from Quiz #1

QuestionAnswer
Ability of Certain Materials to attract iron, cobalt or nickel. Magnetism (Cobalt and Nickel have to be in their purest form)
What is the most common element used for magnets? Nickel
Electrons spinning in prodominantly one direction create a tiny magnet refered to as A Magnetic Dipole
When many of these magnetic dipoles align with each other they create an organized grouping called (use a strong magnetic field to align the dipoles) A Magnetic Domain
Each atom will have a North and South pole Dipole
Lines of force in space Flux
Lines of force in opposing directions attract each other Magnetic Attraction
Lines of the force in the same direction repel each other Magnetic Resistance
First Law of Magnetism 1. Every magnet has a North and South pole.
Second Law of Magnetism 2. Like poles repel and unlike poles attract each other.
Third Law of Magnetism 3. force of attraction (or repulsion) varies directly as the strength of the poles and inversely as the square law of the distace between them. (Yes, inverse square law
Strength of a Magnetic Field (SI Unit tesla (T)
Any spinning electric charge will induce a ____________ Magnetic Field
If every electric charge creates a magnetic field , why is it that everything is not magnetic? The magnetic field will end up cancelling each other out.
Natural Magnets Lodestones
Lodestones are found ___ ___ _______ in the earth
Lodestones consists of an ________. iron ore
Artificial Permanent Magnet manufactured by magnetic induction
Electromagnetic Iron bar wrapped with a wire carrying eletric current. (ONLY magnetic when electricity is flowing through it)
Nonmagnetic Materials Not affected by magnetic fields (ie. glass, wood, plastic)
Diamagnetic Materials Weakly repelled by magnetic fields (ie water, mercury and gold)
Paramagnetic Materials Weakly attracted by magnetic fields. (ie platinum, gadolinium, aluminum)
Ferromagnetic Materials Strongly attracted to magnet (ie iron, cobalt, nickel)
A stronger field will magnetize the material more _____ Strongly
Rubbing Ferromagnetic material against a permanent magnet also helps ________. Bring the atoms into alignment
Heating or dropping a magnet can ______ Knock some of the atoms out of alignment thus weakening the magnetic field.
Superconducting Magnet Used in MRI Resistance is at zero. Current still going.
Created by: swilson3180
 

 



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