Topic 2 1/2 Flashcards
Define and give units for:
electrostatic force
Electric potential difference
Electronvolt
The force between two charged bodies.
is the work done per unit charge on a small positive test charge moved between the points; volts = one joule per coulomb. also called voltage
describes the energy carried by a particle. The work done when an electron moves through a potential difference of 1 volt; eV
Describe:
Hollow conductors:
Pear shaped conductor:
Corona Discharge:
hollow charged objects, within the hollow part there is a zero charge.
Concentrated charge density on point because of the difference in size.
The strong electric fields, near a point of a pear shape, may be large enough to ionise the molecules in the air in the vicinity of the sharp points. This results in a charge movement away from the conductor
Define and give units for:
Electric field strength
The electric force per unit charge (q) experienced by a small positive test charge when placed at that point in the field; Newtons per Coulomb or Volts per meter
State:
my boi Coulomb’s law
The electric force of attraction or repulsion between two charged objects is directly proportional to the products of the two charges and inversely proportional to the square of the distance between their centres.
The electric force acts along the line joining the centres of the charges as though the charge were concentrated at a point.
Describe and show units for:
Electric current:
The flow of positive charge, opposite to the flow of electrons.
Measured in the Ampere, or a flow of one coulomb per second.
Derive:
E=F/q
From coulombs law:
F = 1/(4pieo) x (q1q2)/(r^2)
E= 1/(4pieo) x q/(r^2)
r^2=1/(4pieo) x (q1q2)/F
Therefore:
E= 1/(4pieo) x q/1/(4pieo) x (q1q2)/F
Cancels probably to get:
E=F/q
Derive:
E=V/d
Since V=W/q therefore W=Vq
And W=fd
And F=Eq
Vq=fd
Vq=Eqd
V=Ed
E=V/d
Explain:
The electric forces are consistent with newtons laws
The magnitude of force acting upon two charges due to their electric fields is the same. Newtons third law states that for every action there is an equal and opposite reaction. Electric forces are consistent with newtons third law.
Describe:
The motion of charged particles parallel or antiparticle to a uniform electric field
Comparing the motion of a projectile to motion of a charged particle in a uniform electric field.
similar to gravitational acceleration, instead of acceleration due to gravity, there is acceleration due to electric field.
You doing a graph, what you do.
What are the units for the line
What are the axis
HEADING
Y OVER X
X IS THE INDEPENDANT
Convert energy from electonvolts to joules.
Convert energy from joules to electonvolts.
Apply the equivalent of W=q♤V
Multiply electronvolts 1.6x10^-19 the charge of an electron.
Divide joules by 1.6x10^-19 the charge of an electron.
W = q♤V = 1.6x10^-19 x 1 = 1.6x10^-19 joules
