Charged Particles In A Magnetic Field Pg142 Flashcards
Forced act on charged particles in
Magnetic fields
A force acts on a charged particle moving in a
Magnetic field
Why does a current carrying wire experience a force in a magnetic field
A force acts on a charged particle moving in a magnetic field
Electric current in a wire is the flow in negatively charged electrons
Electric current is the
Flow of charge per unit time
Give equating for force acting on a single charged particle moving through a magnetic field where its velocity is perpendicular to the magnetic field
F=BQv
Charged particles in a Magnetic field are
Deflected in a circular path
Flemings left hand rule says that the force in a …charge in a magnetic field is always perpendicular to its …
Moving
Direction of travel
To use Flemings left hand rule for charged particles, use your second finger (normally current) as the direction of …
If the particle carries a negative charge point your second finger in the…
Motion for a positive charge
Opposite direction to it’s motion
The force due to the magnetic field (F=BQv ) experienced by a particle travelling through a magnetic field is … but the centripetal acceleration it experiences will depend on the …-from Newton’s …law of motion
Independent of the particles mass
Mass
2nd
r=mv/BQ
Greater radius means the particle is
Deflected less
Cyclotrons make use of
Circular deflection
Circular deflection is used in particles accelerators such as
Cyclotrons
Cyclotrons are used in …to produce …
Medicine
Radioactive tracers or high energy beams of racist ion for use in radiotherapy
A cyclotrons is made up of
Two hollow semicircular electrodes with a uniform magnetic field applied perpendicular to the plane of the electrodes and an alternating potential difference applied between the electrodes
Cyclotrons
Charged particles are fired into … The magnetic field makes them follow a (semi)circular path and then …
And applied potential difference Between the electrodes …the particles across the gap until they enter the …
Because the particles speed is slightly higher …before leaving the electrode again
The potential difference is …so that the particle is accelerated again before entering the next electrode . This process repeats as the particle ..,increasing in speed ,before eventually exiting the cyclotron
One of the electrodes
Leave the electrode
Accelerated
The next electrode
It will follow a circular path with a larger radius
Reversed
Spirals outwards
