point charge

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Ahura Mazda - relief of the Zoroastrian god Ahura Mazda at the ancient ruins of Persepolis in Iran. Also known as Ormazd Zoroastrianism,

Which Religion Is the Oldest?

illustration of the walking titanosaurus, Patagotitan mayorum

Titanosaurs: 8 of the World's Biggest Dinosaurs

Groups of depositors in front of the closed American Union Bank, New York City. April 26, 1932. Great Depression run on bank crowd

Causes of the Great Depression

African Americans demonstrating for voting rights in front of the White House as police and others watch, March 12, 1965. One sign reads, "We demand the right to vote everywhere." Voting Rights Act, civil rights.

Timeline of the American Civil Rights Movement

Battle of the Alamo from "Texas: An Epitome of Texas History from the Filibustering and Revolutionary Eras to the Independence of the Republic, 1897. Texas Revolution, Texas revolt, Texas independence, Texas history.

6 Wars of Independence

Illustration for Demystified "How Dangerous is Quicksand"

How Deadly Is Quicksand?

Titanic infographic. The 30th anniversary of its discovery is September 1, 2015. SPOTLIGHT VERSION.

Timeline of the Titanic’s Final Hours

point charge

physics

Learn about this topic in these articles:

electrostatics

In electricity: Calculating the value of an electric field
…the electric field of a point charge. The electric field E produced by charge Q₂ is a vector. The magnitude of the field varies inversely as the square of the distance from Q₂; its direction is away from Q₂ when Q₂ is a positive charge and toward Q₂ when Q₂…
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vector representation of force field

In principles of physical science: Fields
… being the force which a point charge q₁ exerts on another point charge q₂. The combination r/r³ is a vector in the direction of r, the line joining q₁ to q₂, with magnitude 1/r² as required by the inverse square law. When r is rendered in
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