Chapter 30
Electromagnetic Induction
![Induction](https://cloudfront.jove.com/files/media/science-education/science-education-thumbs/13784.jpg)
An emf is induced when the magnetic field in a coil is changed by pushing a bar magnet into or out of the coil. emfs of opposite signs are produced…
![Faraday's Law](https://cloudfront.jove.com/files/media/science-education/science-education-thumbs/13785.jpg)
Faraday's law state that the induced emf is the negative change in the magnetic flux per unit of time. Any change in the magnetic field or change…
![Motional Emf](https://cloudfront.jove.com/files/media/science-education/science-education-thumbs/13787.jpg)
Magnetic flux depends on three factors: the strength of the magnetic field, the area through which the field lines pass, and the field's…
![Faraday Disk Dynamo](https://cloudfront.jove.com/files/media/science-education/science-education-thumbs/13788.jpg)
A Faraday disk dynamo is a DC generator, producing an emf that is constant in time. It consists of a conducting disk that rotates with a constant…
![Induced Electric Fields: Applications](https://cloudfront.jove.com/files/media/science-education/science-education-thumbs/13790.jpg)
An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed…
![Eddy Currents](https://cloudfront.jove.com/files/media/science-education/science-education-thumbs/13791.jpg)
Since eddy currents occur only in conductors, magnets can separate metals from other materials. For example, in a recycling center, trash is dumped…
![Significance of Displacement Current](https://cloudfront.jove.com/files/media/science-education/science-education-thumbs/14094.jpg)
A displacement current is analogous to a real current in Ampère's law, participating in Ampère's law the same way as the usual…
![Electromagnetic Fields](https://cloudfront.jove.com/files/media/science-education/science-education-thumbs/14154.jpg)
Electric fields generated by static charges, often referred to as electrostatic fields, are characteristically different from electric fields created…
![Symmetry in Maxwell's Equations](https://cloudfront.jove.com/files/media/science-education/science-education-thumbs/14099.jpg)
Once the fields have been calculated using Maxwell's four equations, the Lorentz force equation gives the force that the fields exert on a…
![Ampere-Maxwell's Law: Problem-Solving](https://cloudfront.jove.com/files/media/science-education/science-education-thumbs/14207.jpg)
A parallel-plate capacitor with capacitance C, whose plates have area A and separation distance d, is connected to a resistor R and a battery of…
![Electric Generator: Alternator](https://cloudfront.jove.com/files/media/science-education/science-education-thumbs/13794.jpg)
Electric generators induce an emf by rotating a coil in a magnetic field. A simple alternator is an AC generator that creates electrical energy that…
![DC Generator](https://cloudfront.jove.com/files/media/science-education/science-education-thumbs/14205.jpg)
An alternator converts mechanical energy into electrical energy that varies sinusoidally, resulting in AC current. Meanwhile, a DC generator converts…
![Magnetic Damping](https://cloudfront.jove.com/files/media/science-education/science-education-thumbs/14206.jpg)
Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of…
![Superconductor](https://cloudfront.jove.com/files/media/science-education/science-education-thumbs/13796.jpg)
A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to…
![Fabrication of Thin Film Silver/Silver Chloride Electrodes with Finely Controlled Single Layer Silver Chloride](https://cloudfront.jove.com/files/thumbs/60820_t.png)
This paper aims to present a protocol to form smooth and well-controlled films of silver/silver chloride (Ag/AgCl) with designated coverage on top of…
![Combined Transcranial Magnetic Stimulation and Electroencephalography of the Dorsolateral Prefrontal Cortex](https://cloudfront.jove.com/files/thumbs/57983_t.png)
Transcranial magnetic stimulation (TMS) is a non-invasive method that produces neural excitation in the cortex by means of brief, time-varying…