Start learning today, and be successful in your academic & professional career. Start Today!

• ## Study Guides

 1 answerLast reply by: Suresh SundarrajTue Oct 29, 2013 6:48 PMPost by Laron Burrows on October 24, 2013At 37:35 did you forget to divide by k?? 0 answersPost by yannick Haberkorn on October 14, 2013what if the permitivity of free space = 3 or 12 how do you apply coulombs law ? 0 answersPost by yannick Haberkorn on October 11, 2013this stuf is hard ... i need this for my electrical engineering class lol . not good man 0 answersPost by yannick Haberkorn on October 9, 2013i understand that 0,3 is being squared , but why is it multiplied by 10^-1 ? 1 answerLast reply by: Rob EscaleraThu Sep 26, 2013 1:48 AMPost by Sonalya Jayasuriya on February 15, 2012Di Jishi in the problem with the two small spheres what happens to the K after you find the equation for q2 2 answersLast reply by: Bora BasaSat Jun 8, 2013 4:12 AMPost by chris bagwell on August 9, 2011question: why does this law seem similar to newtons law of gravity?

### Coulomb's Law

• Coulomb’s law: if two charges q1 and q2 are separated by a distance r, the magnitude of the force between them is F = k |q1| |q2| / r^2; the force is repulsive if both charges are negative or both are positive, and is attractive otherwise.
• If the force is in Newtons, q1 and q2 in Coulombs, and r in meters, then the constant k that appears in Coulomb’s law is equal to 9 x 10^9 SI units

### Coulomb's Law

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

• Intro 0:00
• Coulomb's Law 0:59
• Two Point Charges by Distance R
• Permitivity of Free Space
• Charges on the Vertices of a Triangle 8:00
• 3 Charges on Vertices of Right Triangle
• Charge of 4, -5 and -2 micro-Coulombs
• Force Acting on Each Charge
• Charges on a Line 21:29
• 2 Charges on X-Axis
• Where Should Q should be Placed, Net Force =0
• Two Small Spheres Attached to String 31:08