Electric charge 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 (commonly carried by protons and electrons respectively). Like charges repel each other and unlike charges attract each other. An object with an absence of net charge is referred to as neutral. Early knowledge of how charged substances interact is now called classical electrodynamics, and is still accurate for problems that do not require consideration of quantum effects.
Electric charge is a conserved property; the net charge of an isolated system, the amount of positive charge minus the amount of negative charge, cannot change. Electric charge is carried by subatomic particles. In ordinary matter, negative charge is carried by electrons, and positive charge is carried by the protons in the nuclei of atoms. If there are more electrons than protons in a piece of matter, it will have a negative charge, if there are fewer it will have a positive charge, and if there are equal numbers it will be neutral. Charge is quantized; it comes in integer multiples of individual small units called the elementary charge, e, about 1.602×10−19 coulombs, which is the smallest charge which can exist freely (particles called quarks have smaller charges, multiples of 1/3e, but they are only found in combination, and always combine to form particles with integer charge). The proton has a charge of +e, and the electron has a charge of −e.
Electric charges produce electric fields. A moving charge also produces a magnetic field. The interaction of electric charges with an electromagnetic field (combination of electric and magnetic fields) is the source of the electromagnetic (or Lorentz) force, which is one of the four fundamental forces in physics. The study of photon-mediated interactions among charged particles is called quantum electrodynamics.The SI derived unit of electric charge is the coulomb (C) named after French physicist Charles-Augustin de Coulomb. In electrical engineering it is also common to use the ampere-hour (Ah). In physics and chemistry it is common to use the elementary charge (e) as a unit. Chemistry also uses the Faraday constant as the charge on a mole of electrons. The lowercase symbol q often denotes charge.

View More On Wikipedia.org
  1. DB is Here

    Other State  Bill Call For Charges Against Gun Owners If Kids Get Weapons

    Bill Call For Charges Against Gun Owners If Kids Get Weapons
  2. User 1234

    Other State  Charges to be dismissed against California farmer

    Weapons charges against member of Bakersfield farming family to be dismissed after judge finds warrant based on faulty information DoJ submitted false facts to judge to obtain warrant; testified it was a mistake based on misreading spreadsheet.
  3. Cavedweller

    Oregon  Judge goes on trial on gun charges

    Suspended Judge Vance Day faces trial Monday on felony gun charges Edit: changed link to full story
  4. Joe Link

    Other State  Ruling: Kansas gun law no defense to federal firearm charges

    Ruling: Kansas gun law no defense to federal firearm charges
  5. Joe Link

    Other State  These guys cut a hole in a Texas gun dealer’s building and stole weapons, charges say

    These guys cut a hole in a Texas gun dealer’s building and stole weapons, charges say
  6. V4Cascade

    Noreen Firearms Hidden Charges

    I was trying to buy 3 stripped uppers from Noreen but their website was having issues with my card so I called it in. Spoke to Nathan and told him what I wanted and the purchase was made. I was told I would receive an Invoice the following day. It's been 3 days and I still haven't received an...
  7. Nick Burkhardt

    Other State  Connecticut man faces charges after shooting at 'ghost'

    <broken link removed> Silly Yankee. He should have used a "Ghost Gun".
  8. trikerdon

    Other State  Tyranny: Calif. Farmer Thrown In Jail After Complying With Gun Registration Law

    California has imposed a plethora of strict gun control laws that appear to be more about discouraging lawful gun ownership than preventing crime and violence. Tyranny: Calif. Farmer Thrown In Jail After Complying With Gun Registration Law
  9. RicInOR

    Charges for Saving Someone

    A person broke a window to retrieve a fire extinguisher inside to save someone from a burning vehicle. <broken link removed>
  10. Joe Link

    National  DOJ Cracks Down on Illegal Firearms: Charges Up 23% From Last Year

    DOJ Cracks Down on Illegal Firearms: Charges Up 23% From Last Year
  11. U

    Seattle Couple facing Felony & Misdemeanor Charges of Assault for acting in self-defense

    After a lengthy investigation, the King County District Attorney's office decided to go forward and charge a Seattle couple that attended the controversial Milo Yiannopolous speech last January at the University of Washington's campus. The husband has been charged with misdemeanor 3rd degree...
  12. Joe Link

    Straw purchaser with 4 felony gun charges will not get jail time

    Straw purchaser with 4 felony gun charges will not get jail time
  13. jsparks747

    New Poaching Charges

    I was just reading the newspaper this morning (people do that!?!?:eek::eek::eek:) and noticed that there was a list of stuff changing in 2017. On the list was new poaching charges. Now if you are convicted of poaching 3 times in the past 10 years, a judge can confiscate your boat, guns, and...
  14. pdempsey1097

    Homicide Justified, Charges to be dropped

    Grand jury: Homicide justified, murder charge to be dropped I have so many questions. If the Marijuana deal was illegal on both sides, then isn't the homicide committed during such a crime a crime itself? Were the guns used by both sides legally obtained, carried, etc? He graduated 11th grade...
  15. 808hondacrguy

    Oh Snap, Pastor who bought the AR15 could face charges for violating SB941

    Here is a plan that backfired LOL Lake Oswego pastor could face charges in transfer of AR-15 (http://portlandtribune.com/pt/9-news/317007-196256-lake-oswego-pastor-could-face-charges-in-transfer-of-ar-15)
  16. D

    Marion County Oregon Charges Unlawful Discharge of Firearm

    I was arrested This saturday for unlawful discharge of my firearm within the Salem Oregon city Limits! However I live in Marion County Oregon not within the city limits! On my personal property, owned out right! Neighbor Called And 8 Sheriffs showed up afterward and arrested me searched my house...
Back Top