Chapter 22 - Electric Fields Flashcards
what is an electric field
a region in which charged particles are subject to an electrostatic force
electric field lines direction
positive to negative
what way do electric field lines act
perpendicular to the surface
electric field strength equation
e = f /q
electric field strength units
newtons per coulomb
coulombs law
any two point charges exert an electrostatic force between them which is proportional to the product of their charges and inversely proportional to the square of the distance between them
permittivity definition
ability of a material to become polarised and store charge
differences between electrical and gravitational fields
-in gravitational, mass creates a field. in electrical, charge creates the field.
-in gravitational, field strength is force per unit mass. in electrical, field strength is force per unit charge
similarities between electrical and gravitational fields
-both produce a radial point
-both follow inverse square law for force
how is a uniform electrical field produced
between two oppositely charged plates
electrical potential definition
the work done per unit charge to bring a positive charge from infinity to that point
formula for the potential at a point in an electric field
V = W / Q
what do field lines show
the path a positive test charge would take when placed in an electric field
what do closer field lines represent
a stronger electric field
formula for potential between two parallel plates
v = E x d
