Elecrtomagnetism Flashcards
When considering 2 point charges separated by a distance
What type of law is
a) Force and Charge
b) Force and distance
a) proportional
b) inverse square law
What is k
9x10^(9)
What are
F
E
V
And what are their units
F = electrostatic force (N)
E = electric field strength (NC-1)
V = electrostatic potential (V or JC-1)
What is electric field strength?
Force acting per unit positive charge placed at a point in an electric field
Formula for:
A) electrostatic force
B) magnetic force
A) F=QE
B) F=qvB
Formula from Millikan’s oil drop experiment and derivation
Electrostatic force = weight
QE = mg
QV
—— = mg
d
Electron volt to joules conversion
1eV = 1.6x10^(-19) J
What causes a material to be magnetic
The electrons in the magnetic dipoles are all spinning the same way
Attract or repel?
A) Two wires carrying current in opposites directions
B) Two wires carrying current in the same direction
A) repel
B) attract
Definition of a Tesla
The magnetic induction of a magnetic field in which a conductor of length 1 metre carrying a current of 1 ampere perpendicular to the field is acted on by a force of 1 Newton
Magnetic force when current carrying wire is
A) perpendicular
B) parallel
A) maximum, F=BIL
B) F=0
Explain helical motion
Component of velocity of charged particle parallel to magnetic field provides constant linear velocity
Component of velocity of charger particle perpendicular to magnetic field causes circular motion
Combination of both means helical path
What happens if you increase velocity in a velocity selector
v⬆️
F(B)
⬆️
F(B)>F(E)
F(UN)⬇️
a⬇️
s⬇️
How does velocity selector show different isotopes
Different isotopes have different masses and same charge. Therefore the radius of the semi circular print will be different for different isotopes as mass is proportionate to radius
