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Chapter 28

Magnetic Forces and Fields

Magnetismo
Magnetismo
Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows ...
Campi magnetici
Campi magnetici
A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on ...
Linee di campo magnetico
Linee di campo magnetico
The representation of magnetic fields by magnetic field lines is very useful in visualizing the strength and direction of the magnetic field. Each of the ...
Flusso magnetico
Flusso magnetico
The magnetic flux measures the number of magnetic field lines passing through a given surface area. The SI unit for magnetic flux is the weber (Wb). ...
Movimento di una particella carica in un campo magnetico
Movimento di una particella carica in un campo magnetico
A charged particle experiences a force when moving through a magnetic field. Consider the field to be uniform and the charged particle to move ...
Forza magnetica
Forza magnetica
In addition to the electric forces between electric charges, moving electric charges exert magnetic forces on each other. A magnetic field is created by a ...
Forza magnetica su un conduttore che trasporta corrente
Forza magnetica su un conduttore che trasporta corrente
Moving charges experience a force in a magnetic field. Since the magnetic fields produced by moving charges are proportional to the current, a conductor ...
Forza magnetica sui fili che trasportano corrente: esempio
Forza magnetica sui fili che trasportano corrente: esempio
In a magnetic field, moving charges encounter a force. If a wire contains these moving charges, i.e., if the wire is carrying a current, then a force acts ...
Forza su un circuito di corrente in un campo magnetico
Forza su un circuito di corrente in un campo magnetico
Magnetic forces on wires carrying current are most frequently applied in motors. A DC motor is a device that converts electrical energy into mechanical ...
Coppia su un anello di corrente in un campo magnetico
Coppia su un anello di corrente in un campo magnetico
The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between ...
L'effetto Hall
L'effetto Hall
Edwin H. Hall, in the year 1879, devised an experiment that could be used to identify the polarity of the predominant charge carriers in a conducting ...
Esperimento e/m di Thomson
Esperimento e/m di Thomson
In a beam of charged particles created by a heated cathode, the particles move at different speeds. However, many applications need a beam with uniform ...
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