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Medical Imaging - Test 3
Terms in this set (32)
Describe the different types of magnets and their properties. (Test short answer question)
Natural magnets - found in the Earth, also called lodestones, thought to have gained their magnetism from the Earth's magnetic field
Artificial permanent magnets - manufactured, a non-magnetized magnetic material that is exposed to a strong magnetic field
Electricity and magnetism are two different parts of the same phenomenon known as what?
Magnetism is the ability of certain materials to attract ___, ___, or ___.
Iron (most common
In magnetic materials, the orbital electrons of its atoms ___ in predominantly one direction.
When many of these "atomic magnets" or dipoles align with each other, they create an organized grouping know as what?
T or F: Atoms have a north and south pole.
Magnetic fields consists of lines of force in space called what?
Lines of force travel from the ___ to the ____ INSIDE the magnet and from the ___ to the ___ as curved lines in space OUTSIDE the magnet.
South Pole, North Pole
North Pole, South Pole
What is lines of force in opposing directions that attract each other?
What is lines of force in the same direction that oppose each other?
What is distorted by magnetic materials and unaffected by non magnetic materials?
What are the three laws of magnetism?
1. Every magnet has N and S poles
2. Like poles repel & unlike poles attract
3. Attraction (or repulsion) varies directly as the strength of the poles and inversely as the square of the distance b/w them (Inverse Square Law)
The strength of a magnetic field is measured in an SI unit known as the what?
The average magnetic field strength of the earth is about...
5x10^-5 T (0.00005 T)
T or F: Any spinning electric charge will induce a magnetic field.
T or F: Natural magnets are called permanent magnets.
False, natural magnets are called lodestones
T or F: Artificial permanent magnets are manufactured.
What are materials that are not affected by magnetic fields? (Glass, wood, plastic)
What are materials that are weakly repelled by magnetic fields? (Water, mercury, gold)
What are materials that are weakly attracted to magnetic fields? (Platinum, gadolinium, aluminum)
What are materials that are strongly attracted to magnets? (Iron, cobalt, nickel)
T or F: Rubbing ferromagnetic material against a permanent magnet helps bring atoms into alignment.
T or F: Heating a magnet or dropping it can knock some of the atoms out of alignment, thereby weakening the magnetic field.
The magnetic field created by a current expands and collapses if the current is a(n) what?
Alternating current (AC)
What term refers to the switching of the poles?
The first coil, which generates the magnetic field, is called the ___ coil.
What is the term that refers to how one current induces another current in another coil?
What law states that an induced current flows in the direction that opposes the action that induces it?
The secondary current will flow in the
same or opposite
direction of the primary current?
Opposite (Lenz's law)
As soon as the magnetic field reaches its maximum size, the current action will ____.
Self-induction is used in the x-ray circuit in the _____ design.
Read through Chapter 4 in book.
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