Electromagnetic Induction

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 by …

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 in …

The direction in which the induced emf drives the current around a wire loop can be found through the negative sign. However, it is usually easier to …

Magnetic flux depends on three factors: the strength of the magnetic field, the area through which the field lines pass, and the field's orientation …

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 angular …

The fact that emfs are induced in circuits implies that work is being done on the conduction electrons in the wires. What can possibly be the source of …

An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge …

Since eddy currents occur only in conductors, magnets can separate metals from other materials. For example, in a recycling center, trash is dumped in …

Ampère's law, in its usual form, does not work in places where the current changes with time and is not steady. Thus, Maxwell suggested including …

James Clerk Maxwell (1831–1879) was one of the major contributors to physics in the nineteenth century. Although he died young, he made major …

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 …

Generators convert mechanical energy into electrical energy, whereas motors convert electrical energy into mechanical energy. A motor works by sending a …

A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a …

A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the …

A displacement current is analogous to a real current in Ampère's law, participating in Ampère's law the same way as the usual …

Once the fields have been calculated using Maxwell's four equations, the Lorentz force equation gives the force that the fields exert on a charged …

Electric fields generated by static charges, often referred to as electrostatic fields, are characteristically different from electric fields created by …

An alternator converts mechanical energy into electrical energy that varies sinusoidally, resulting in AC current. Meanwhile, a DC generator converts …

Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a …

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 voltage …

James Clerk Maxwell (1831–1879) was one of the significant contributors to physics in the nineteenth century. He is probably best known for having …