Coulomb's Law - Net Electric Force & Point Charges

This physics video tutorial explains the concept behind coulomb's law and how to use it to calculate the electric force between two and three point charges. This video contains plenty of examples and practice problems for students taking high school or college level physics.
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00:02 Coulomb's Law calculates the electric force between point charges. 02:41 Coulomb's law explains the relationship between electric forces and point charges. 07:41 The video discusses Coulomb's Law, units of electric charge and distance, and provides a practice problem 10:06 The net electric force between two point charges can be calculated using Coulomb's Law. 14:53 The distance between the two point charges is 2.078 centimeters. 17:14 Calculate the magnitude of the two identical point charges. 21:48 The electric charge of one electron is negative 1.6 times 10 to the negative 19 coulombs. 23:59 The net electric charge on the metal sphere is -400 coulombs. 28:25 The net force acting on charge two is the sum of the forces exerted by charge one and charge three. 30:45 The net electric force acting on the 200 micro coulomb charge is 1994 Newtons. 35:36 The net force acting on charge one is -8.75 N.

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12:42 I got 7.2 N

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You shouldn't watch this video while scrolling through comments ! And thanks ❤️ for this epic video

At 3:20, you have written K = 9 * 10^9 N/m^2c^2. Its actually meant to be K = 9 * 10^9 N m^2/c^2

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Hi sir on the 21:12 part of your vid i just want to ask if i should also cancel the square of 0.40m^2, I cancelled it but i got the wrong answer but then when i didn't cancel it i got the same as yours. What should i do?

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You have to also square the .40. So it would look like (.40)^2

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Bro thank you so much but the net force should be zero on 30:55 because q3 is -50uC so Fnet= 11.25N+(-11.25N)= 0 N right?

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Magnitude does not count + or - of the value

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Hello, thanks for the video. I have a question, is it always a "must" to ignore the negative sign of a charge when calculating the magnitude of the force?

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How did you got the answer for the second problen which is 9.428 x 10^ -5 dividing the answer for (500)(0.40) from 9 x 10 ^9?

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9.428x10^-5 is the same to 94.28uC. uC= 10^-6C

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Why do you use 9x10^9 instead of 8.99? Is it okay if the answers are different because of this change?

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