Edexcel A Level Physics:复习笔记7.19 Lenz's Law
Lenz's Law Lenz’s Law is used to predict the direction of an induced e.m.f in a coil or wire Lenz's Law is summarised below: The induced e.m.f is set up in a direction to produce effects that oppos...
Edexcel A Level Physics:复习笔记7.18 Induced E.M.F between Linked Coils
Induced E.M.F between Linked Coils An e.m.f can be induced in a coil when there is a change of current in another coil linked with this coil This is what happens in a transformer Transformers A tra...
Edexcel A Level Physics:复习笔记7.17 Induced E.M.F in a Moving Coil
Induced E.M.F in a Moving Coil Electromagnetic induction is a phenomenon which occurs when an e.m.f is induced when a conductor moves through a magnetic field If there is a change in magnetic flux ...
Edexcel A Level Physics:复习笔记7.16 Magnetic Force on a Current-Carrying Conductor
Magnetic Force on a Current-Carrying Conductor A current-carrying conductor produces its own magnetic field An external magnetic field will therefore exert a magnetic force on it A current-c...
Edexcel A Level Physics:复习笔记7.15 Magnetic Force on a Charged Particle
Magnetic Force on a Charged Particle The magnetic force on an isolated moving charged particle, such as a proton, is given by the equation: F = BQv Where: F = magnetic force on the particle (N) B =...
Edexcel A Level Physics:复习笔记7.14 Magnetic Flux Density, Flux & Flux Linkage
Magnetic Flux, Flux Density & Flux Linkage Magnetic Flux Density The strength of a magnetic field is defined by the density of the magnetic field lines, or magnetic flux density, at that point ...
Edexcel A Level Physics:复习笔记7.13 Exponential Discharge in a Capacitor
Exponential Discharge in a Capacitor The Discharge Equation When a capacitor discharges through a resistor, the charge stored on it decreases exponentially The amount of charge remaining on the cap...
Edexcel A Level Physics:复习笔记7.12 Core Practical 11: Investigating Capacitor Charge & Discharge
Required Practical: Charging & Discharging Capacitors Aim of the Experiment The overall aim of this experiment is to calculate the capacitance of a capacitor. This is just one example of how th...
Edexcel A Level Physics:复习笔记7.11 Charge & Discharge Curves
Charge & Discharge Curves Charging Curves Capacitors are charged by a power supply (e.g. a battery) When charging, electrons are 'pulled' from the plate connected to the positive terminal of th...
