Test 2 Flashcards
The four types of electrical material are:
Conductors, insulators, semiconductors, and superconductors.
Which material is not a conductor? Copper penny Silver dollar Wooden stick Saltwater
Wooden stick
Which of these materials is not an insulator? Copper wire Plastic spoon Rubber knife Wooden ruler
Copper wire
The force fields created by a magnet are called
Lines of flux
A(n) —– will conduct an electric current with no resistance.
Superconductor
The three methods of generating static charges are:
Friction, induction, and contact.
The unit of electric charge is the
Coulomb
What is the smallest unit of electric charge?
Electron
The force between two positive charges is
Repulsion
The force between a positive and a negative charge is
Attraction
The ability with which a material can be magnetized is its
permeability
Materials that are weakly repelled by all magnetic fields are
diamagnetic
The electrostatic law states that
an electron will repel an electron.
------- is a very good conductor. Rubber Copper Glass Wood
Copper
The SI units of magnetism are the
weber and tesla
Which of these materials is not ferromagnetic? Iron Wood Nickel Cobalt
Wood
Which of these materials is ferromagnetic? Wood Glass Cobalt Plastic spoon
Cobalt
A ferromagnetic material is
strongly influenced by magnetic fields.
The ability of a magnet to resist demagnetization is called
retentivity
Which statement is not one of the laws of magnetism?
- like poles repel
- unlike poles attract
- the force between magnets increases with the square of the distance between them.
- the force between magnets decreases with the square of the distance between them.
The force between magnets increases with the square of the distance between them.
What is the main function of an x-ray system?
To convert electric energy into electromagnetic energy.
Describe “ground” or “neutral” potential.
Earth is the neutral or ground potential
This is because it has + and – charges equally distributed
It is always available to accept electric charges
The smallest unit of electric charges are:
Electron (negative)
Proton (positive)
The proton & electron each have one unit of charge
Electric charges deal with
the negative electric charges associated with the electron.