# Shared Flashcard Set

## Details

Physics II Exam 1
Electric Feilds, Potential Energy, Potential, Capacitors
16
Physics
01/27/2011

Term
 Electric charge is conserved
Definition
 It can neither be created or destroyed, the charge of the universe is constant
Term
 Electric charge is quantized
Definition
 It is measured in integer multiples of a fundamental chagre e=1.6E-19
Term
 Electric Field
Definition
 The force per unit charge at a point in spaceE = (4(pi)kQ)/A
Term
 Electric field lines
Definition
 graphic mapping of the field
Term
 Conductor
Definition
 little force needed to strip electrons, electricity flows freely
Term
 Insulator
Definition
 requires strong electric field to cause electrons to conduct
Term
 Semi-condutor
Definition
 Conductivity between insulator and condutor
Term
 Electrostatics
Definition
 charges at rest in/on a material, producing an electric field.-Field is zero everywhere inside a charged conductor if charges at rest-any excess charge on a conductor is on the surface-the elective field at the outer surface of a charged conductor is perpendicular to the surface-excess charge accumulates at sharpest points, and is where electric field is strongest
Term
 Electric potential energy
Definition
 energy necessary to move point A to point B
Term
 Voltage
Definition
 Change in potential energy per unit chargeV= Ed or W/Q (Joules/Coulomb)
Term
 Potential
Definition
 the energy per unit charge required to bring a positive charge in from infinity to that point
Term
 Equipotential Surface
Definition
 surface where the electric potential is the same a all points on the surface.
Term
 Capacitor
Definition
 Stores electric charge in the form of an electric field.
Term
 Capacitance
Definition
 the charge per unit volt stored on one plate of a capacitor
Term
 Dielectric constant
Definition
 the ratio of the capacitance with a material between plates to the capacitance without any material
Term
 Dielectric
Definition
 made up of polar molecules for which the material becomes polar when placed in a field
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