Physics - Chapter 5 Flashcards
The study of stationary electric charges
Electrostatics
What can electrification be created by?
Contact, friction, induction
Where is the electric charge of a conductor concentrated?
Along the sharpest curvature of the surface
What is the unit of electric potential?
Volt
What is the study of electric charges in motion?
Electrodynamics
A substance that electrons easily flow
Conductor
A material that does not allow electron flow
Insulator
A material that behaves as a conductor and a insulator
Semiconductor
What results from increasing electric resistance?
Reduced electric current
Electrons that flow in only one direction
DC
Electrons that flow alternately in opposite directions
AC
What does any charged particle in motion create?
Magnetic field
The imaginary lines of a magnetic field are always:
Closed loops
The ability of a material to attract the lines of magnetic field intensity
Magnetic permeability
Materials are weakly repelled by either magnetic pole. They can not be artificially magnetized. They are not attracted to a magnet
Diamagnetic
Strongly attracted by a magnet and usually can be permanently magnetized by exposure to a magnetic field
Ferromagnetic
Material lie somewhere between ferromagnetic and nonmagnetic. They are very slightly attracted to a magnet
Paramagnetic
The small magnet created by the electron orbit
Magnetic dipole
The degree to which a material can be magnetized
Magnetic susceptibility
Can be made into magnets by induction
Ferromagnetic
The SI unit of magnetic field strength
Tesla
Electric potential is measured in units of:
Joule per coulomb OR volt
What does any charge in motion induce?
Magnetic field
What is a coil of wire called?
Solenoid
Current carrying coil of wire wrapped around an iron core
Electromagnet
An electric current is induced in an electric circuit if some part of that circuit is in a changing magnetic field
Electromagnetic induction
What induces an electric current
Varying magnetic field intensity
What powers the rotating anode of an xray tube?
Induction motor
What changes the intensity of alternating voltage and current?
Transformer
What has one winding and varies both voltage and current
Autotransformer
What governs the interaction of magnetic poles?
Magnetic field
What governs the interaction of electrostatic charges?
Electric field
Which way does the electric field point from a positive charge?
Outward
Which way does the electric field point from a negative charge?
Inward
