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  2. Electric charge - Wikipedia

    en.wikipedia.org/wiki/Electric_charge

    Electric charge (symbol q, sometimes Q) is the physical property of matter that causes it to experience a force when placed in an electromagnetic field. Electric charge can be positive or negative. Like charges repel each other and unlike charges attract each other. An object with no net charge is referred to as electrically neutral.

  3. Coulomb's law - Wikipedia

    en.wikipedia.org/wiki/Coulomb's_law

    If both charges have the same sign (like charges) then the product is positive and the direction of the force on is given by ^; the charges repel each other. If the charges have opposite signs then the product q 1 q 2 {\displaystyle q_{1}q_{2}} is negative and the direction of the force on q 1 {\displaystyle q_{1}} is − r ^ 12 {\textstyle ...

  4. Electrostatic induction - Wikipedia

    en.wikipedia.org/wiki/Electrostatic_induction

    The electrostatic field (lines with arrows) of a nearby positive charge (+) causes the mobile charges in metal objects to separate. Negative charges (blue) are attracted and move to the surface of the object facing the external charge. Positive charges (red) are repelled and move to the surface facing away. These induced surface charges create ...

  5. Electromagnetism - Wikipedia

    en.wikipedia.org/wiki/Electromagnetism

    Electric charges attract or repel one another with a force inversely proportional to the square of the distance between them: opposite charges attract, like charges repel. [ 7 ] Magnetic poles (or states of polarization at individual points) attract or repel one another in a manner similar to positive and negative charges and always exist as ...

  6. Electric field - Wikipedia

    en.wikipedia.org/wiki/Electric_field

    When the charges and have the same sign this force is positive, directed away from the other charge, indicating the particles repel each other. When the charges have unlike signs the force is negative, indicating the particles attract.

  7. Introduction to electromagnetism - Wikipedia

    en.wikipedia.org/wiki/Introduction_to...

    By convention, the direction of the electric field is the same as the direction of the force on positive charges and opposite to the direction of the force on negative charges. [3] [4] Because positive charges are repelled by other positive charges and are attracted to negative charges, this means the electric fields point away from positive ...

  8. Electrostatics - Wikipedia

    en.wikipedia.org/wiki/Electrostatics

    The electrostatic field (lines with arrows) of a nearby positive charge (+) causes the mobile charges in conductive objects to separate due to electrostatic induction. Negative charges (blue) are attracted and move to the surface of the object facing the external charge. Positive charges (red) are repelled and move to the surface facing away ...

  9. Sources of electrical energy - Wikipedia

    en.wikipedia.org/wiki/Sources_of_electrical_energy

    There are two main types of electrical charge: positive and negative. Each type of charge attracts the opposite type and repels the same type. This can be stated in the following way: Like charges repel and unlike charges attract. Static electricity has several applications.