Edexcel•A-Level•Physics
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Electric and Magnetic Fields
Electric fields, capacitance, magnetic fields and electromagnetic induction
Practice 60 subtopics in Electric and Magnetic Fields. All questions match the Edexcel A-Level specification.
About Electric and Magnetic Fields
Electric and Magnetic Fields is a key topic in the Edexcel A-Level Physicsspecification. This topic covers electric fields, capacitance, magnetic fields and electromagnetic induction.
Master all 60 subtopics below with unlimited AI-generated questions. Each subtopic page includes sample questions and the ability to generate unlimited practice questions with detailed solutions.
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Electric field conceptElectric field linesField patterns around chargesUniform field between parallel platesElectric field strength: E = F/QE = V/d for uniform fieldCoulomb's law: F = kQ₁Q₂/r²Permittivity of free space ε₀k = 1/(4πε₀)E = kQ/r² for point chargeElectric potential: V = kQ/rPotential difference and work doneEquipotential surfacesMotion of charges in uniform fieldsCapacitor structure and functionCapacitance: C = Q/VParallel plate capacitor: C = ε₀A/dEffect of dielectricsRelative permittivity εᵣC = ε₀εᵣA/dEnergy stored: E = ½QV = ½CV²Capacitors in seriesCapacitors in parallelCharging capacitors through resistorsDischarging capacitorsTime constant: τ = RCExponential charge/discharge equationsQ = Q₀e^(-t/RC)I = I₀e^(-t/RC)V = V₀e^(-t/RC)Core practical: Capacitor dischargeMagnetic flux density BMagnetic field patternsField around straight wireField around solenoidForce on current-carrying wire: F = BILF = BIL sin θForce on moving charge: F = BQvFleming's left-hand ruleMotion of charges in magnetic fieldsCircular paths of charged particlesr = mv/(BQ)Velocity selectorMass spectrometer principleMagnetic flux: Φ = BAFlux linkage: NΦ = BANFaraday's law: ε = -N(dΦ/dt)Lenz's lawEMF from flux changesGenerator and alternator principlesCore practical: Investigating EMIAC waveformsPeak and RMS valuesIrms = I₀/√2Vrms = V₀/√2Power in AC circuitsTransformersNs/Np = Vs/Vp = Ip/IsTransformer efficiencyPower transmission
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