Core - Physics

    Chapter 22

    Electric Charges and Fields

    22.1 : Electric Charges01:11

    22.1 : Electric Charges

    From lightning during thunderstorms to electronic devices, the phenomenon of electromagnetism is all around us. The electromagnetic force is one of the ...

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    22.2 : Sources and Properties of Electric Charge01:15

    22.2 : Sources and Properties of Electric Charge

    All objects we see around us consist of atoms, which combine to form molecules. The lightest element in the universe is hydrogen, and a hydrogen atom ...

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    22.3 : Conductors and Insulators01:19

    22.3 : Conductors and Insulators

    Some materials may easily let electrical charges pass through them, while others obstruct their flow. The former are called conductors and the latter ...

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    22.4 : Charging Conductors By Induction01:15

    22.4 : Charging Conductors By Induction

    The Earth is a good conductor of electricity, and it is so big that it can be considered an infinite source or sink of charges. It can easily exchange ...

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    22.5 : Coulomb's Law01:30

    22.5 : Coulomb's Law

    Experiments with electric charges have shown that if two objects each have an electric charge, they exert an electric force on each other. The magnitude ...

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    22.6 : Coulomb's Law and The Principle of Superposition01:15

    22.6 : Coulomb's Law and The Principle of Superposition

    Coulomb's Law describes the force experienced by two point charges under each other's presence. But what if there are more than two charges? For ...

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    22.7 : Comparison Between Electrical And Gravitational Forces01:24

    22.7 : Comparison Between Electrical And Gravitational Forces

    There are four fundamental forces in nature: the gravitational force, the electromagnetic force, the strong nuclear force, and the weak nuclear force. To ...

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    22.8 : Electric Field01:16

    22.8 : Electric Field

    Consider two point charges, each exerting Coulomb force on the other. It is possible to describe the Coulomb interaction via an intermediate step by ...

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    22.9 : Electric Field of Two Equal and Opposite Charges01:30

    22.9 : Electric Field of Two Equal and Opposite Charges

    Atoms generally contain the same number of positively and negatively charged particles, protons, and electrons. Hence, they are electrically neutral. ...

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    22.10 : Continuous Charge Distributions01:17

    22.10 : Continuous Charge Distributions

    Imagine a bucket of water. It contains many molecules, of the order of 1026 molecules. Thus, although it contains discrete elements (molecules) at the ...

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    22.11 : Electric Field of a Continuous Line Charge01:19

    22.11 : Electric Field of a Continuous Line Charge

    In physics, symmetry in a system means that something in the considered system remains unchanged due to a specific operation to which it is subjected. For ...

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    22.12 : Electric Field of a Charged Disk01:23

    22.12 : Electric Field of a Charged Disk

    The simplest case of a surface charge distribution is the uniformly charged disk. Calculating its electric field also helps us calculate the electric ...

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    22.13 : Electric Field Lines01:25

    22.13 : Electric Field Lines

    The three-dimensional representation of the electric field of a positive point charge requires tracing the electric field vectors, whose lengths decrease ...

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    22.14 : Properties of Electric Field Lines01:25

    22.14 : Properties of Electric Field Lines

    The definition of electric field lines greatly eases the visualization of electric fields, a vector field, especially in the presence of many charges. The ...

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    22.15 : Electric Dipoles and Dipole Moment01:30

    22.15 : Electric Dipoles and Dipole Moment

    Consider two charges of equal magnitude but opposite signs. If they cannot be separated by an external electric field, the system is called a permanent ...

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    22.16 : Induced Electric Dipoles01:28

    22.16 : Induced Electric Dipoles

    A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the ...

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