Magnetic Fields Flashcards
How can the direction of a magnetic field in a wire be found?
› Using the right hand grip rule
› Where direction of current is the thumb, and the fingers are the direction of the field
How can the direction of the magnetic field, or direction of current flow, be found in a solenoid?
› Using the right hand grip rule
› Thumb points towards the north pole, fingers are the current flow
When charged particles experience a force, how can the direction of that force be found?
› Fleming’s left hand rule for a wire or protons/positive charge
› Fleming’s right hand rule for electrons/negative charge
What are the three types of particle accelerators?
› Linac (linear accelerator)
› Cyclotron
› Synchrotron
How is the acceleration achieved in a Linac?
› Alternating current to flip the polarity at the centre of each tube
› Keeps the particle attracted to each tube, causing accelation in the gaps
› Tubes get longer to accommodate for the increasing speed of the particle
How is the acceleration achieved in a cyclotron accelerator?
› Composed of two dees
› Change in polarity due to an alternating current while the particle is inside each dee
› Particle accelerates in the gap between the dees
› In one oscillation, the gap is crossed twice
How is the acceleration achieved in a synchrotron accelerator?
› The polarity switches when the particle is inside each drift tube (similar to Linac) due to alternating current
› To keep the radius constant as speed increases, the magnetic field strength must also increase
Explain the processes involved in the production of the Hall voltage using a Hall probe
› Magnetic field is perpendicular to the current flowing
› Using Fleming’s left hand rule, the direction which the electrons move can be found
› This force is due to the current flowing in a magnetic field
› Build up of charge creates an electric field which can be measured by a voltmeter to find the Hall voltage
