Kara Sears
French physicist Charles-Augustin de Coulomb, born on June 14, 1736, is known for formulating Coulomb's Law, which calculates the amount of force between two electrically charged particles at rest. Coulomb's interest in measuring the electrical force between small charged objects led him to invent the torsion balance, an apparatus that could reliably measure such small forces. In 1785, he published his first three reports on electricity and magnetism, stating his law, which played a pivotal role in developing the theory of electromagnetism.
| Characteristics | Values |
|---|---|
| Name | Charles-Augustin de Coulomb |
| Birth Date | 14 June 1736 |
| Birthplace | Angoulême, France |
| Death Date | 23 August 1806 |
| Occupation | French physicist, military engineer, inspector of public instruction |
| Known For | Formulation of Coulomb's law, invention of torsion balance |
| Education | Degree from an engineering school at Mezieres |
| Publications | First three reports of electricity and magnetism (1785) |
| Awards/Honors | SI unit for electrical charge is called Coulomb (C) in his honor |
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What You'll Learn
French physicist Charles-Augustin de Coulomb
Back in France, Coulomb continued his engineering work and presented his first paper to the Académie des Sciences in Paris in 1773. He was later stationed in Rochefort, where he collaborated on building a wooden fort near Île-d'Aix. In 1781, he was stationed in Paris, and in 1785, he published his first three reports on electricity and magnetism, which included his statement of what became known as Coulomb's law. This publication was pivotal to the development of the theory of electromagnetism. Coulomb utilised a torsion balance to examine the repulsion and attraction forces of charged particles. He discovered that the magnitude of the electric force between two point charges is directly proportional to the product of the charges and inversely proportional to the square of the distance between them.
Coulomb's law, or Coulomb's inverse-square law, is an experimental law of physics that calculates the force between two electrically charged particles at rest. This force is known as the electrostatic force or Coulomb force. Coulomb's law holds even within atoms, accurately describing the force between the positively charged atomic nucleus and negatively charged electrons. It also explains the forces that bind atoms and molecules together to form solids and liquids. Coulomb's work on electricity and magnetism was groundbreaking, and he went on to publish six more papers on these subjects by 1791.
In addition to his work on electricity and magnetism, Coulomb made significant contributions in other areas. He conducted important research on friction and machinery, windmills, and the elasticity of metal and silk fibres. His work on earth pressure and retaining wall design laid the foundation for the development of soil mechanics. Coulomb's achievements have been recognised through various honours, including having his name inscribed on the Eiffel Tower and the SI unit of electric charge, the coulomb, being named after him.
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The torsion balance
Coulomb's torsion balance consists of a glass case with a needle hanging from a thread, typically made of silk, and a narrow glass tube extending through the top. To use the device, Coulomb would hold an object near the metal sphere at the upper end of the metal rod. Any charge held by the object would transfer to the metal sphere and travel down the rod to the sphere at the other end. This would cause the needle to become charged and repel the sphere, resulting in movement. The twisting action of the thread is called torsion, giving the instrument its name.
Coulomb's torsion balance allowed him to study electrostatic forces and offer proof of the inverse square law that bears his name. According to Coulomb's law, the electric force between objects is inversely proportional to the distance between them. This discovery revolutionized our understanding of electricity and magnetism.
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The inverse-square law
Coulomb's Law, formulated by French physicist Charles-Augustin de Coulomb, is an experimental law of physics that calculates the amount of force between two electrically charged particles at rest. Coulomb's Law is also known as Coulomb's inverse-square law, as it states that the force between two electrical charges is directly proportional to the product of the charges and inversely proportional to the square of the distance between them.
Coulomb's Law can be expressed mathematically as:
F = k * (q1 * q2) / r^2
Where F is the force, k is Coulomb's constant, q1 and q2 are the magnitudes of the charges, and r is the distance between the charges.
Coulomb's Law is similar to Isaac Newton's inverse-square law of universal gravitation. However, a key difference is that gravitational forces always cause attraction, while electrostatic forces can cause attraction or repulsion depending on the charges. Coulomb's experiments in the 1780s involved measuring the electrostatic repulsion between two charged spheres as a function of the distance between them using a sensitive torsion balance.
Coulomb's Law was essential to the development of the theory of electromagnetism and may even be considered its starting point. It also has applications within atoms, correctly describing the force between the positively charged atomic nucleus and the negatively charged electrons.
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The development of electromagnetism
Coulomb's work built upon the earlier research of Joseph Priestley, who had stated the law of electrical repulsions. Coulomb's interest in this field was sparked by his work as an engineer. He had graduated from an engineering and military college in 1761 and worked as an engineer and lieutenant in the French military. In 1764, he travelled to Martinique to supervise the construction of a fort, where his health suffered due to the tropical climate. Upon his return to France, he shifted his focus to physics.
Coulomb's experiments in the 1780s involved measuring the electrostatic repulsion between two charged spheres as a function of the distance between them. He used a torsion balance, a scientific apparatus for measuring very weak forces, to conduct these experiments. Coulomb's findings led to the conclusion that the force between two charges is directly proportional to the product of the charges and inversely proportional to the square of the distance between them. This law is similar to Isaac Newton's inverse-square law of universal gravitation, although electrostatic forces can be attractive or repulsive, whereas gravitational forces are always attractive.
Coulomb's law was a significant development in the understanding of electrical forces and the relationship between electric charges. It also provided a foundation for further advancements in electromagnetism and atomic physics. The SI unit for electrical charge, the coulomb, is named in honour of Charles-Augustin de Coulomb.
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The calculation of electric fields
Coulomb's law, formulated by French physicist Charles-Augustin de Coulomb, is an experimental law of physics that calculates the amount of force between two electrically charged particles at rest. This electric force is also known as the electrostatic force or Coulomb force. The law was first published in 1785 and was essential to the development of the theory of electromagnetism.
Coulomb's law states that the magnitude, or absolute value, of the attractive or repulsive electrostatic force between two point charges is directly proportional to the product of the magnitudes of their charges and inversely proportional to the square of the distance between them. This means that as the distance between two charged particles increases, the force between them decreases, and vice versa.
The magnitude of the electric field E can be derived from Coulomb's law. By choosing one of the point charges as the source and the other as the test charge, Coulomb's law can be used to calculate the magnitude of the electric field E created by a single source point charge Q at a certain distance from it, r, in a vacuum. The equation for this calculation is:
> {\displaystyle \mathbf {E} (\mathbf {r} )={1 \over 4\pi \varepsilon _{0}}\sum _{i=1}^{n}q_{i}{{\hat {\mathbf {r} }}_{i} \over {|\mathbf {r} _{i}|}^{2}}}
In this equation, ε0 is the vacuum electric permittivity, q1 and q2 are the quantities of each charge, and r is the distance between the charges. The units of measurement used in the SI system for these values are C (Coulomb) for the charges, m (metre) for the distance, and F m-1 for the electric field vector.
Coulomb's law holds even within atoms, accurately describing the force between the positively charged atomic nucleus and each of the negatively charged electrons. This simple law also correctly explains the forces that bind atoms together to form molecules and the forces that bind atoms and molecules together to form solids and liquids.
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Frequently asked questions
French physicist Charles-Augustin de Coulomb created Coulomb's Law.
Coulomb's Law calculates the amount of force between two electrically charged particles at rest. It is an experimental law of physics.
Coulomb's Law was first published in 1785.
