Key term
CCEA A-Level Physics 1210
Physical Quantities, Scalars and Vectors
Moments and Equilibrium
Linear Motion and Dynamics
Newton's Laws of Motion
Linear Momentum and Impulse
Work, Energy and Power
Current, Charge and Potential Difference
Resistance and Resistivity
Topic overviewResistance and Ohm's lawOhmic and non-ohmic behaviourResistors in series and in parallelInvestigating current, voltage and resistance in series and parallel circuitsElectrical power and energy in resistive circuitsResistivity and the equation R = ρl/AMeasuring the resistivity of a metalCurrent–voltage characteristics of a conductor, a lamp and a diodeResistance, temperature and superconductivity
Internal Resistance and Potential Dividers
Topic overviewInternal resistance and terminal potential differenceConsequences of internal resistance for external circuitsMeasuring electromotive force and internal resistanceThe potential divider and variable outputPotential dividers in lighting and heating control circuitsLoaded potential dividers and output voltage calculations
Waves
Refraction
Lenses
Superposition, Interference and Diffraction
Topic overviewSuperposition of wavesStanding waves, nodes and antinodesStanding waves on stretched stringsStanding waves in a pipe closed at one endMeasuring the speed of sound with a resonance tubeConditions for observable interferencePath difference and phase differenceYoung's double slitDiffraction at a single slitThe diffraction grating
Quantum Physics
Wave-Particle Duality
Astronomy
Practical Skills and Data Analysis
Topic overviewChoosing and using measuring instrumentsPrecision, accuracy and recording measurementsUsing the cathode ray oscilloscope to measure voltage and frequencyTables, graphs and presenting resultsLinearising a relationship and using the gradientAbsolute and percentage uncertaintyCombining uncertainties and uncertainty on a graphRandom and systematic error, reliability and refining an experiment
Deformation of Solids
Thermal Physics
Topic overviewBoyle's law, Charles's law and the pressure lawThe ideal gas equation pV = nRTThe Avogadro constant, the mole and pV = NkTInternal energy and the distribution of molecular energyThe kinetic theory equation pV = ⅓Nm⟨c²⟩Average molecular kinetic energy and temperatureAbsolute zero and the kelvin scaleSpecific heat capacity and the electrical method
Uniform Circular Motion
Simple Harmonic Motion
Topic overviewDefining simple harmonic motion and a = −ω²xDisplacement, velocity and acceleration: x = A cos ωtThe simple pendulum and T = 2π√(l/g)The loaded spiral spring and T = 2π√(m/k)SHM graphs and finding velocity from a gradientFree vibrations, forced vibrations and resonanceDamping: light, critical and over-damping
The Nucleus and Radioactive Decay
Topic overviewAlpha-particle scattering and the nuclear atomNuclear radius and nucleon numberThe density of nuclear matterAlpha, beta and gamma radiation: nature, penetration and rangeNuclear equations and changes in nucleon and proton numberThe random and exponential nature of radioactive decayActivity, the decay constant and A = −λNExponential decay calculations with A = A₀e^(−λt)Half-life and measuring it
Nuclear Energy, Fission and Fusion
Gravitational Fields
Electric Fields
Capacitors
Magnetic Fields
Charged Particles and Accelerators
Charged Particles and Accelerators
Charged particles in a uniform electric field
- 3 things to know
- Unit A2 2
Overview
Recall questions on why a charge feels a force whatever its speed, F = qE and the directions for a positive and a negative charge, the parabolic path of a charge fired across the field and the analogy with a projectile, the acceleration qE/m, worked calculations for an electron, and why deflection depends on the charge to mass ratio.
What you need to know
Answer each one before you reveal it.
Your recallNot started
Key term
Give the equation for the force on a charge in an electric field and define each symbol.
Key term
In which direction does the force act on a positive charge?
Questions from this subtopic
Each one with the model answer underneath.
- 1
Why does a charge placed in a uniform electric field experience a force?
Model answer
The field exerts a force on any charge within it, of magnitude qE, because that is what the field strength means.
- 2
Give the equation for the force on a charge in an electric field and define each symbol.
Model answer
F = qE, where F is the force in newtons, q the charge in coulombs and E the electric field strength in N C⁻¹ or V m⁻¹.
- 3
In which direction does the force act on a positive charge?
Model answer
Along the field direction, from the positive plate towards the negative plate.
- 4
In which direction does the force act on a negative charge?
Model answer
Against the field direction, so an electron is pushed towards the positive plate.
- 5
Does the force on a charge in an electric field depend on how fast the charge is moving?
Model answer
No, the force is qE whatever the speed, and it acts even on a stationary charge.
- 6
Describe the path of a charged particle fired into a uniform electric field at right angles to it.
Model answer
A parabola, because there is a constant acceleration in one direction and constant velocity at right angles to it.
Other ways to work this
The same content, four other ways.
What is inside Levo
Six ways to work the same material.
Every question in Charged Particles and Accelerators, on a schedule.
Attempt a question from memory, write the correct version, then attempt it again. Levo records the jump between your first attempt and your last, and brings each question back on the day you are due to forget it.
Or £46 a year, about £3.83 a month. Cancel anytime.