Electric Force - Revision history

Akhan442: /* Practice Problems */

2025-11-28T16:32:26Z

Practice Problems

← Older revision		Revision as of 12:32, 28 November 2025
Line 57:		Line 57:
	<iframe src="https://trinket.io/embed/glowscript/31d0f9ad9e" width="100%" height="500"></iframe>		<iframe src="https://trinket.io/embed/glowscript/31d0f9ad9e" width="100%" height="500"></iframe>

	== Practice Problems ==		Practice Problems

	~~'''~~Problem 1~~.'''~~		Problem 1:
	Two charges +3 μC and -2 μC are 0.40 m ~~apart~~. Find the magnitude of the electric force.		Two charges of +3 μC and –2 μC are separated by 0.40 m. Find the magnitude of the electric force between them.
			F = k * \|q1 q2\| / r^2
			F = (8.99×10^9) * (3×10^-6)(2×10^-6) / (0.40)^2
			F = 0.34 N

	~~'''Solution:'''~~		Problem 2:
	~~$$ F = k \frac{\|q_1 q_2\|}{r^2} = (8.99×10^9)\frac{(3×10^{-6})(2×10^{-6})}{(0.40)^2} = 0.34\,\text{N} $$~~		Two electrons are separated by 1 nm. What is the electric force between them?
			F = k * e^2 / r^2
	~~'''~~Problem 2~~.'''~~		F = (8.99×10^9) * (1.6×10^-19)^2 / (1×10^-9)^2
	Two electrons are 1 nm ~~apart~~. What force ~~do they exert on each other~~?		F = 2.3×10^-10 N

	~~'''Solution:'''~~
	$$ F = k ~~\frac{~~e^2}{r^2} = (8.99×10^9)~~\frac{~~(1.6×10^{-19})^2}{(1×10^{-9})^2} = 2.3×10^{-10~~}\,\text{~~N~~} $$~~

	== Sources ==		== Sources ==

Akhan442: /* Vector Form of the Electric Force */

2025-11-28T16:31:12Z

Vector Form of the Electric Force

← Older revision		Revision as of 12:31, 28 November 2025
Line 31:		Line 31:
	Electric force has direction. The vector equation is:		Electric force has direction. The vector equation is:

	~~$$ \vec{F}_{12}~~ = k ~~\frac{q_1 q_2}{r^2} \hat{r}_{12} $$~~		⃗F₁₂ = k * (q₁ q₂ / r²) * r̂₁₂

	where ~~$ \hat{r}_{12} $ is~~ a unit vector ~~pointing~~ from charge 1 to charge 2.		where r̂₁₂ represents a unit vector that points from the position of charge 1 to the position of charge 2.

	== Common Misconceptions ==		== Common Misconceptions ==

Akhan442: /* Coulomb’s Law */

2025-11-28T16:29:55Z

Coulomb’s Law

← Older revision		Revision as of 12:29, 28 November 2025
Line 15:		Line 15:
	The electric force between two point charges is:		The electric force between two point charges is:

	$$ F = k ~~\frac{~~\|~~q_1 q_2~~\|}{r^2~~} $$~~		F = k * \|q1 q2\| / r^2

	where:		where:

	* $ F $ = electric force (Newtons)		F = electric force (Newtons)
	* $ k = 8.~~99\times10~~^9~~\, \text{N·m}^2~~/~~\text{C}^2 $~~ (Coulomb’s constant)
	* $ q_1, ~~q_2 $~~ = charges		k = 8.99×10^9 N·m²/C² (Coulomb’s constant)
	* $ r $ = distance between the charges
			q1, q2 = the two point charges

			r = distance between the charges

	== Vector Form of the Electric Force ==		== Vector Form of the Electric Force ==

Akhan442: Improved and expanded the Electric Force page by adding a clear introduction, key concepts, vector form of Coulomb’s Law, real-world examples, common misconceptions, fully worked practice problems, and properly cited public-domain images. Added an embedded GlowScript simulation to meet computational model requirements and reorganized the page to follow the official template. Removed outdated content and ensured all text and media meet copyright rules.

2025-11-28T16:29:01Z

Improved and expanded the Electric Force page by adding a clear introduction, key concepts, vector form of Coulomb’s Law, real-world examples, common misconceptions, fully worked practice problems, and properly cited public-domain images. Added an embedded GlowScript simulation to meet computational model requirements and reorganized the page to follow the official template. Removed outdated content and ensured all text and media meet copyright rules.

Show changes

Archithv at 03:01, 4 December 2024

2024-12-04T03:01:49Z

← Older revision		Revision as of 23:01, 3 December 2024
Line 176:		Line 176:

	http://www.jfinternational.com/ph/coulomb-law.html		http://www.jfinternational.com/ph/coulomb-law.html
			Location to Add: Replace "References"

			Text to Add:

			OpenStax College, "Electric Forces and Fields," OpenStax Physics.
			HyperPhysics, "Electric Force," HyperPhysics.
			Charles-Augustin de Coulomb's Original Experiments, Public Domain Sources.



	[[Category:Forces]]		[[Category:Forces]]

Archithv at 02:52, 4 December 2024

2024-12-04T02:52:56Z

← Older revision		Revision as of 22:52, 3 December 2024
Line 73:		Line 73:

	==Examples==		==Examples==

			Problem-Solving Strategy for Electric Forces
			Identify the charges and their locations.
			Draw a diagram to visualize the problem.
			Apply Coulomb's law and calculate the magnitude of forces.
			Resolve forces into components if necessary.
			Sum the components to find the net force.

	===Simple===		===Simple===

Archithv at 02:11, 4 December 2024

2024-12-04T02:11:59Z

← Older revision		Revision as of 22:11, 3 December 2024
Line 1:		Line 1:
	'''CLAIMED BY ~~Amanda McHugh~~ Fall ~~2023~~'''		'''CLAIMED BY Archith Venkatesh Fall 2024'''

	==The Main Idea==		==The Main Idea==

Archithv at 02:11, 4 December 2024

2024-12-04T02:11:24Z

← Older revision		Revision as of 22:11, 3 December 2024
Line 132:		Line 132:

	Thinking more complexly, the electric force is also prevalent in almost all forms of modern technology involving electricity. One particular example is the process of charging a smartphone: the electric force allows a current to be generated which transfers charge from outlets to the internal battery of these devices. A final, slightly more complicated example of the electric force is seen in the production of abrasive paper, whereby positively charged-smoothing particles are attracted to a negatively charged, smooth surface to create papers like sandpaper.		Thinking more complexly, the electric force is also prevalent in almost all forms of modern technology involving electricity. One particular example is the process of charging a smartphone: the electric force allows a current to be generated which transfers charge from outlets to the internal battery of these devices. A final, slightly more complicated example of the electric force is seen in the production of abrasive paper, whereby positively charged-smoothing particles are attracted to a negatively charged, smooth surface to create papers like sandpaper.

			==Practical Applications of Electric Force==
			Medical Imaging: Electric forces are crucial in technologies like MRI, which rely on electromagnetic principles to produce detailed images of the human body.
			Semiconductors and Transistors: Electric forces govern the behavior of electrons in semiconductors, forming the basis of modern electronics like computers and smartphones.
			Particle Accelerators: Electric forces are used to accelerate charged particles to high speeds for research in physics and medical treatments, such as cancer radiation therapy.

	==History==		==History==

	French physicist Charles-Augustin de Coulomb discovered in 1785 that the magnitude of electric force between two charged particles is directly proportional to the product of the absolute value of the two charges and inversely proportional to the distance squared between the two particles. He experimented with a torsion balance which consisted of an insulated bar suspended in the air by a silk thread. Coulomb attached a metal ball with a known charge to one end of the insulated bar. He then brought another ball with the same charge near the first ball. This distance between the two balls was recorded. The balls repelled each other, causing the silk thread to twist. The angle of the twist was measured and by knowing how much force was required for the thread to twist through the recorded angle, Coulomb was able to calculate the force between the two balls and derive the formula for electric force.		French physicist Charles-Augustin de Coulomb discovered in 1785 that the magnitude of electric force between two charged particles is directly proportional to the product of the absolute value of the two charges and inversely proportional to the distance squared between the two particles. He experimented with a torsion balance which consisted of an insulated bar suspended in the air by a silk thread. Coulomb attached a metal ball with a known charge to one end of the insulated bar. He then brought another ball with the same charge near the first ball. This distance between the two balls was recorded. The balls repelled each other, causing the silk thread to twist. The angle of the twist was measured and by knowing how much force was required for the thread to twist through the recorded angle, Coulomb was able to calculate the force between the two balls and derive the formula for electric force.
			In the 20th century, the understanding of electric forces advanced significantly with the advent of quantum electrodynamics (QED). QED explains electric and magnetic forces at the quantum level, showing that these forces are mediated by virtual photons. This understanding has been crucial for developing modern technologies, from semiconductors to lasers.


	This [https://www.youtube.com/watch?v=FYSTGX-F1GM\| video] explains Coulomb's experiment and the corresponding derivation of his law.		This [https://www.youtube.com/watch?v=FYSTGX-F1GM\| video] explains Coulomb's experiment and the corresponding derivation of his law.

	It wasn't until much later, however, that the fundamental charge (the charge on an electron) was discovered when Millikan ran his [https://physics.aps.org/articles/v5/9 oil drop experiment] in 1913 that this value was determined.		It wasn't until much later, however, that the fundamental charge (the charge on an electron) was discovered when Millikan ran his [https://physics.aps.org/articles/v5/9 oil drop experiment] in 1913 that this value was determined.

			== Glossary ==
			Coulomb: Unit of electric charge.
			Electric Field: A field surrounding a charged particle, exerting force on other charges.
			Point Charge: An idealized model of a charge concentrated at a single point.


	== See Also ==		== See Also ==

Amchugh9 at 15:51, 24 November 2023

2023-11-24T15:51:45Z

← Older revision		Revision as of 11:51, 24 November 2023
Line 1:		Line 1:
	'''CLAIMED BY ~~Luis Pimentel Spring 2018~~'''		'''CLAIMED BY Amanda McHugh Fall 2023'''

	==The Main Idea==		==The Main Idea==

Lduffy8: /* A Mathematical Model */

2019-07-25T18:45:32Z

A Mathematical Model

← Older revision		Revision as of 14:45, 25 July 2019
Line 9:		Line 9:

	===A Mathematical Model===		===A Mathematical Model===
	The Coulomb Force Law		'''The Coulomb Force Law'''

	The formula for the magnitude of the electric force between two point charges is:		The formula for the magnitude of the electric force between two point charges is: