D.3 Motion in Electromagnetic Fields Flashcards
If a charged particle is moving…
A magnetic field is created around it, so it will experience a force due to the interaction of the two fields
What type of motion does a charged particle undergo?
Circular motion as the magnetic force acts at 90* to the particle’s velocity
Charge:mass ratio for a charged particle
Its specific charge. It can be determined by making measurements of the charged particle’s motion in a uniform magnetic field
Kinetic energy gained by a charged particle is equal to…
The work done on it
What happens to charged particles in uniform electric fields?
The particle will be parallel to the field lines, so the force will only act on the component of the velocity in the direction of the field lines. The particle therefore undergoes parabolic motion (like a projectile)
Magnetic field - magnitude of force
qvB
Electric field - magnitude of force
Eq
Magnetic field - direction of force
Perpendicular to velocity
Electric field - direction of force
Parallel to field lines
Magnetic field motion
Circular
Electric field motion
Parabolic
How can electric and magnetic fields be combined?
In a velocity selector - it only allows charged particles of a particular velocity to pass through
Velocity selector
Electric field and magnetic fields at 90* to each other
What forces does a proton in a velocity selector experience?
An electric force downwards (Eq) and a magnetic force upwards (qvB)
What happens to protons with too high of a velocity?
They experience a magnetic force>electric force and curve upwards
What happens to protons with too low of a velocity?
They experience a magnetic force<electric force and curve downwards
What happens to current carrying conductors in magnetic fields?
They experience a force called the motor effect as it interacts with its own magnetic field
What happens to parallel current carrying wires?
They will have a force between them due to the interaction of their magnetic fields
Two parallel current carrying wires with current in the same direction
Force will be attractive - fields cancel out in the between wires and wires are pulled together
Two parallel current carrying wires with current in the opposite direction
Force will be repulsive - fields add together between wires and wires are pushed apart
