Alternating Currents & Potential Differences An alternating current (a.c) is defined as: A current which periodically varies between a positive and negative value This means the direction of an...
Faraday's Law Faraday's Law connects the rate of change of flux linkage with induced e.m.f It is defined in words as: The magnitude of the induced e.m.f is directly proportional to the rate of chan...
在大学里，同学们可以根据自己的兴趣找到一个符合自己理想职业道路的专业。哪些大学专业更受欢迎？毕业后更有前途？都是大家非常关注的问题。 普林斯顿评论根据对就业前景、校友薪水和受欢迎程度的调查，编撰了这...
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...
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...
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 ...
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...
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 =...
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 ...
