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Chapter 28

Magnetic Forces and Fields

磁性
磁性
Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows ...
磁场
磁场
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 ...
磁力线
磁力线
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 ...
磁通量
磁通量
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). ...
带电粒子在磁场中的运动
带电粒子在磁场中的运动
A charged particle experiences a force when moving through a magnetic field. Consider the field to be uniform and the charged particle to move ...
磁力
磁力
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 ...
载流导体上的磁力
载流导体上的磁力
Moving charges experience a force in a magnetic field. Since the magnetic fields produced by moving charges are proportional to the current, a conductor ...
载流导线上的磁力:示例
载流导线上的磁力:示例
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 ...
磁场中电流环路上的力
磁场中电流环路上的力
Magnetic forces on wires carrying current are most frequently applied in motors. A DC motor is a device that converts electrical energy into mechanical ...
磁场中电流环路上的扭矩
磁场中电流环路上的扭矩
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 ...
霍尔效应
霍尔效应
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 ...
汤姆森的 e/m 实验
汤姆森的 e/m 实验
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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