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rest of study guide questions for tuesday's class
Terms in this set (54)
When two objects are rubbed together electrons can move between objects thus charging both?
What a charged object is touched to a neutral object electrons are exchanged that gives the neutral object the same exchange?
Process of charging a neutral object by inserting the object in the electrostatic field of a charged object, the 2 objects don't touch?
What is the first law of electrostatic?
Like charges repel each other, unlike charges attract each other
What is the second law of electrostatic?
Electric charges are located only on the external surface of a charged object
What is the third law of electrostatics?
The force between two charges is directly proportional to the product of their magnitudes and inversely proportional to the square of the distance between the.(Coulombs law)
What surrounds every charged object?
What is any material that naturally exhibits the property of magnetism?
not man made, Natural magnet
What are examples of natural magnets?
What is a man made material that exhibits the property of magnetism?
What is an example of an artificial magnet?
Alnico- a strong artificial magnet made of aluminum
What is the first law of magnetism?
Regardless of size or shape every magnet has two poles.. Northpole and south pole
What is the second law of magnetism?
Like magnetic poles repel each other, unlike magnetic poles attract each other
What is the third law of magnetism? What is this law also called?
The force of attraction or repulsion between two magnetic poles is directly proportional to the product of the strengths of the poles and inversely proportional to the square of the distance between the poles.... Law of Gauss
Surrounding each magnet is a field of magnetic energy composed of lines of force called?
What are the 5 flux properties?
1. Flux leave the north pole of the magnet and travel through space around the magnet and re-enter the magnet at its south pole- outside 2. Some flux will travel too far from the magnet with insufficient energy to return to the magnet and 'leak away' resulting in a loss of magnetism- flux leakage 3. Flux form closed loops "magnetic circuits" and flux lines from the same magnet never cross over each other 4. Flux that travel in same direction repel each other. Flux that travel in opposite direction attract each other 5. Flux patterns can be distorted by inserting a magnetic material in the flux field.
How does magnetic flux travel inside?
From south to north
What are the 2 magnetic movements?
orbital magnetic moment
spin magnetic moment
any element which is strongly attracted to a magnet
Weakly attracted to a magnet?
Any element weakly repelled by a magnet?
Any element not affected in any way by a magnet?
What is the energy moving through space that demonstrates both electrical and magnetic properties?
Electromagnetic Radiation (EMR)
What are the EMR radiations in order of increasing energy?
1. Radio Frequency Radiation 2.Microwave radiation 3. Infrared Radiation 4. Visible light Radiation 5. Ultraviolet 6. X-radiation 7. Gamma Radiation
How does all EMR move through space?
As pure energy without mass- photon
What are the 6 general properties of EMR?
Velocity, waveform, amplitude, wavelength, frequency, period
What are the 2 properties of magnetism?
Permeability and retentivity
What is permeability?
How easily which a substance can be magnetized
What is Retentivity?
Ability of a magnet to retain it magnetivity
Substances which are high in permeability, have what kind of Retentivity?
Substances which are low in permeability, have what kind of Retentivity?
High in retentivity
What is the intensity of the radiation beam is inversely proportional to the square of the exposure distance (SID)
Inverse square law
What is the formula for the inverse square law?
What is EMF?
Electromotive force, will move the charges from an area of high concentration to an area of lower concentration until an equilibrium is reached.
What law says the current intensity is directly proportional to Electromotive force and inversely proportional to resistance?
What law says power is directly proportional to the product of intensity and electromotive force?
What is the formula for Ohm's law?
What is the formula for Watt's law?
What law says an EMF will be induced into a conductor while the conductor interacts with a magnetic field?
What is an ampere?
Current Quantity (intensity)
What is a volt?
Current force (speed)
What is Ohm?
Current Resistance (diameter of conductor)
What is Watt?
Unit of power
What is the unit of electrical resistance?
What is a device that has a fixed amount of resistance?
What is the symbol for Resistor?
What is a device that has a variable amount of resistance?
What is the symbol for Rheostat?
Which timer uses only solid state components, and is the most comment type of exposure timer?
How does the electronic timer operate?
By charging a silicon controlled rectifier through a capacitor which then triggers the exposure
what are the units of radiation?
What is a timer that does not require the technologist to pre-select a certain exposure time instead the time is automatically selected?
What is the automatic timer also known as?
Automatic exposure control or phototimers
What is the transfer of heat by particle motion between solids?
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