ELECTRIC FIELDS Flashcards
what is an electric field
the region around a body which other charges will feel a force
what are electric field lines
show the shape and direction of the field
what is electric field strength
the force per unit positive charge.
how is an electric field caused
by an electric charge, which the field exerts an electrical force on any charged object in the field.
an electric field be attractive and repulsive
yes
that is the equation for electric field strength
E=F/Q
With F being the size of the force and Q being the size of the positive charge
what is coulombs law
F=Qq/4π∑r^2
the electrical force, F, between two point charges is directly proportional to the product of their charges and inversely proportional to the square of their separation.
what is the permittivity of free space
the physical constant which relates the size of the force between the electric charges in free space.
value of 8.85x10^-12
what is the resultant force on a point charge
the vector sum of all the forces
how can we sub in E=FQ into F=Qq/4π∑r^2
E=Q/4π∑r^2
permittivity ∑
constant related to size of capacitor. of plate separation
d, and area, a, C=a∑/d
how do you calculate the Voltage of two parallel lates when a charge moves through it.
Fd/q=v
fd= workdone=energy
what happens when you place a charge in a uniform electric field. Think about force
it will accelerate, as there is a constant force.
we can apply f=ma
depending on the charge, there will be a parabolic motion
calculate electric potential in a radial field
v= Q/4π∑r
state Lenz law
The direction of the emf is such as to oppose the change/motion that caused it.
