CIE A Level Physics复习笔记20.1.9 Velocity Selection
Velocity Selection A velocity selector is defined as: A device consisting of perpendicular electric and magnetic fields where charged particles with a specific velocity can be filtered Velocity sel...
CIE A Level Physics复习笔记20.1.8 Motion of a Charged Particle in a Magnetic Field
Motion of a Charged Particle in a Uniform Magnetic Field A charged particle in uniform magnetic field which is perpendicular to its direction of motion travels in a circular path This is because th...
CIE A Level Physics复习笔记20.1.7 Using a Hall Probe
Measuring Magnetic Flux Density using a Hall Probe A Hall probe can be used to measure the magnetic flux density between two magnets based on the Hall effect It consists of a cylinder with a flat s...
CIE A Level Physics复习笔记20.1.6 Hall Voltage
Hall Voltage The Hall voltage is a product of the Hall effect Hall voltage is defined as: The potential difference produced across an electrical conductor when an external magnetic field is applied...
CIE A Level Physics复习笔记20.1.5 Force on a Moving Charge
Calculating Magnetic Force on a Moving Charge The magnetic force on an isolating moving charge, such an electron, is given by the equation: F = BQv sinθ Where: F = force on the charge (N) B = magne...
CIE A Level Physics复习笔记20.1.4 Magnetic Flux Density
Magnetic Flux Density Definition The magnetic flux density B is defined as: The force acting per unit current per unit length on a current-carrying conductor placed perpendicular to the magnetic fi...
CIE A Level Physics复习笔记20.1.3 Fleming's Left-Hand Rule
Fleming's Left-Hand Rule The direction of the force on a charge moving in a magnetic field is determined by the direction of the magnetic field and the current Recall that the direction of the curr...
CIE A Level Physics复习笔记20.1.2 Force on a Current-Carrying Conductor
Force on a Current-Carrying Conductor A current-carrying conductor produces its own magnetic field When interacting with an external magnetic field, it will experience a force A current-carrying co...
CIE A Level Physics复习笔记20.1.1 Representing Magnetic Fields
Magnetic Field Definition A magnetic field is a field of force that is created either by: Moving electric charge Permanent magnets Permanent magnets are materials that produce a magnetic field A st...
CIE A Level Physics复习笔记19.2.2 Capacitor Discharge Equations
The Time Constant The time constant of a capacitor discharging through a resistor is a measure of how long it takes for the capacitor to discharge The definition of the time constant is: The time t...
CIE A Level Physics复习笔记19.2.1 Capacitor Discharge Graphs
Capacitor Discharge Graphs So far, only capacitors charged by a battery have been considered This is when the electrons flow from the positive to negative plate At the start, when the capacitor is ...
CIE A Level Physics复习笔记19.1.5 Energy Stored in a Capacitor
Calculating Energy Stored in a Capacitor Recall the electric potential energy is the area under a potential-charge graph This is equal to the work done in charging the capacitor to a particular pot...
