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Electric Charge and Field
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Physics Textbooks Boundless Physics Electric Charge and Field Overview
Physics Textbooks Boundless Physics Electric Charge and Field
Physics Textbooks Boundless Physics
Physics Textbooks
Physics
Concept Version 7
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Charge Separation

Charge separation, often referred to as static electricity, is the building of space between particles of opposite charges.

Learning Objective

  • Identify factors that can create charge separation


Key Points

    • Because electrons are labile (i.e., they can be transferred from atom to atom), it is possible for "charge separation" to occur. This phenomenon is often commonly referred to as static electricity.
    • Charge separation can be created by friction, pressure, heat, and other charges.
    • Charge separation can reach a critical level, whereat it is discharged. Lightning is a common example.

Terms

  • nucleus

    the massive, positively charged central part of an atom, made up of protons and neutrons

  • discharge

    the act of releasing an accumulated charge

  • static electricity

    an electric charge that has built up on an insulated body, often due to friction


Full Text

All matter is composed of atoms made up of negatively-charged electrons and positively-charged protons. In the ground state, each atom is of neutral charge—its protons and electrons are equal in number, and it exists with no permanent dipole. Because electrons are labile (i.e., they can be transferred from atom to atom) it is possible for the phenomenon of "charge separation" (often referred to as static electricity) to occur.

In chemistry, this charge separation is illustrated simply by the transfer of an electron from one atom to another as an ionic bond is formed. In physics, there are many other instances of charge separation that cannot be written as formal chemical reactions. Consider, for example, rubbing a balloon on your hair. Once you pull the balloon away, your hair will stand on end and "reach" towards the balloon. This is because electrons from one have transferred to the other, causing one to be positive and the other to be negative. Thus, the opposite charges attract. A similar example can be seen in playground slides (as shown in ).

Static Electricity

Due to friction between her hair and the plastic slide, the girl on the left has created charge separation, resulting in her hair being attracted to the slide.

Charge separation can be created not only by friction, but by pressure, heat, and other charges. Both pressure and heat increase the energy of a material and can cause electrons to break free and separate from their nuclei. Charge, meanwhile, can attract electrons to or repel them from a nucleus. For example, a nearby negative charge can "push" electrons away from the nucleus around which they typically orbit. Charge separation occurs often in the natural world. It can have an extreme effect if it reaches a critical level, whereat it becomes discharged. Lightning is a common example.

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