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Electricity
Taken from Quiz #1
Question | Answer |
---|---|
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. |