Edexcel A Level Physics:復習筆記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:復習筆記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:復習筆記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:復習筆記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:復習筆記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:復習筆記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:復習筆記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:復習筆記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:復習筆記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...
