Core - Physics

    Chapter 28

    Magnetic Forces and Fields

    28.1 : Magnetism01:30

    28.1 : Magnetism

    Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows ...

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    28.2 : Magnetic Fields01:27

    28.2 : Magnetic Fields

    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 ...

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    28.3 : Magnetic Field Lines01:19

    28.3 : Magnetic Field Lines

    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 ...

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    28.4 : Magnetic Flux01:18

    28.4 : Magnetic Flux

    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). ...

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    28.5 : Motion Of A Charged Particle In A Magnetic Field01:22

    28.5 : Motion Of A Charged Particle In A Magnetic Field

    A charged particle experiences a force when moving through a magnetic field. Consider the field to be uniform and the charged particle to move ...

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    28.6 : Magnetic Force01:18

    28.6 : Magnetic Force

    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 ...

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    28.7 : Magnetic Force On A Current-Carrying Conductor01:25

    28.7 : Magnetic Force On A Current-Carrying Conductor

    Moving charges experience a force in a magnetic field. Since the magnetic fields produced by moving charges are proportional to the current, a conductor ...

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    28.8 : Magnetic Force On Current-Carrying Wires: Example01:22

    28.8 : Magnetic Force On Current-Carrying Wires: Example

    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 ...

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    28.9 : Force On A Current Loop In A Magnetic Field01:17

    28.9 : Force On A Current Loop In A Magnetic Field

    Magnetic forces on wires carrying current are most frequently applied in motors. A DC motor is a device that converts electrical energy into mechanical ...

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    28.10 : Torque On A Current Loop In A Magnetic Field01:13

    28.10 : Torque On A Current Loop In A Magnetic Field

    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 ...

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    28.11 : The Hall Effect01:30

    28.11 : The Hall Effect

    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 ...

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    28.12 : Thomson's e/m Experiment01:19

    28.12 : Thomson's e/m Experiment

    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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