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Coulomb operator - Wikipedia, the free encyclopedia

is the one-electron Coulomb

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Question:And please help with this one as well. Trying to teach self from book and internet for extra. Thank you. What is the force on two point charges of 10-6 C that are 20 cm apart?

Answers:If the charge on the electron is e = 1.6021176462 x 10^-19 C. Then in 1 coulomb of charge there will be: - number of electrons = 1/1.6021176462 x 10^-19 Which is 6.241509745 x 10^18 electrons. The force between two point charges q1 and q2, separated by a distance 'r' is given by Coulomb's law: - F = ...1 . q1.q2 ......__ . ____ ..... 4 0 . r Substituting values this equation becomes: - F = 10^-6 x 10^-6/(4 x 3.14 x 8.854 x 10^-12 x 0.2 ) Hence, F = 0.2247 N (rounded to 4 DP) (Using calculator constants for 0)


Answers:one electron is 1.60217646 10-19 C 1 coulomb is 6.242197253 * 10 ^ 18 electrons

Question:A charge of -3.2E-8 Coulombs consists of how many electrons? I know that the charge on an electron is -1.6E-19 Coulombs, but I don't understand how to find out how many electrons it equals.

Answers:Remember stoichiometry from chemistry? Set it up just like that. Mathematically, you divide -3.2E-8/-1.6E-19. -3.2E-8 c X (1 electron/ -1.6E-19 c)

Question:I understand the mathematical formula of coulomb's law but i'm trying to grasp what the coulomb is exactly. I know it is the measure of charge but my textbook is saying that 1 Coulomb is a large force and 1 coulomb is equal to the charge of 1 * 10^19 electrons ect. But aren't 10^19electrons charged commonly seen like i'm sure a charged penny has 10^19 charged electrons. or a charged peace of clothing has 10^19 electrons or more. I'm assuming coulomb measurements are small because only a small amount of those particles are charged? Anyone have an easy explanation i'm confused? This is for my own knowledge and curiosity.

Answers:It's always refreshing and rewarding to try to answer a question asked out of curiosity and wanting to get to know things. From what You wrote, I assume You're asking Yourself if all of the electrons are actually charged. All electrons are charged in exactly the same way, i.e. they carry what is known as "elementary charge" of 1.602 10^-19 C. Every electron carries this charge and it cannot change. How much an object is charged is due to excess electrons, compared to other charged particles, namely positively charged protons in atomic nuclei. Since matter is made of atoms, which contain protons in their nuclei and electrons in their orbits, an atom is generally neutral although it can contain many protons and electrons. But if a piece of material contains excess electrons, it will have a net negative charge. How much is this charge? If an object has 10 electrons more than protons, the excess charge will be 10*(1.602 10^-19 C). All the remaining electrons and protons cancel each other out in their charge, so You don't see the effect on a macroscopic object. If it has more electrons, You'll see the negative charge exerting force on other nearby charged objects, and if it has a lack of electrons (less electrons than protons), the object will have a net positive charge. Depending on how much electrons You remove or add, You'll create a more or less charged object. If You add circa 10^19 electrons, the object will become charged by approx. 1 coulomb of charge. So, a "coulomb" can be thought of as a measure of how many excess or lacking electrons are there in a macroscopic object, the electrons being "charge carriers". And the more electrons You want removed (or added), i.e. the more You want to charge an object, the more powerful generator You need for this, to act against the attractive forces that act between protons and electrons, trying to keep them together. To remove the first electron, Your generator needs to act against the Coulomb force of only one remaining excess proton in the object; after You've removed 10^6 electrons, when removing the next electron, Your generator needs to work against the force of 10^6 excess protons that remained, which exert a larger force on that electron. How much force? - that can be calculated from Coulomb's law.

From Youtube

One Gram of Electrons :One Gram of Electrons1. The electron numbers are either fantastically small or infinitely large. The scale is so untypical for us, that we just cannot grasp it. For instance, the mass of the electron is 2. nine multiplied by ten in the minus twenty eighth power grams. 3. Exactly how small is this number? In order to grasp it, let us count the number of electrons having a total mass of one gram. 4. Divide one by nine multiplied by ten in the minus twenty eighth power. The result is ten in the twenty seventh power electrons. 5. The number is huge. Let's compare it with another big number, the number of electrons constituting the 1 ampere current. As we know, at the current of 1 ampere 1 coulomb of electricity passes through the cross section of the conductor,6. that is six point three by ten in the eighteenth power electrons. 7. By how much exactly does the former number (1027) exceed the latter (6,3 ?1018)? If we have one gram of electrons at our disposal, for how long shall we manage to feed a device requiring 0.5 .to function? Let's find out for how long 1 gram of electrons can support the 1 ampere current first. . We divide the number of electrons in a gram by the number of electrons in a coulomb: 8. ten in the twenty seventh power by six point three by ten in the eighteenth power. The result is approximately one point six multiplied ten in the eighth power seconds. This is about forty four thousand hours or one thousand and eight hundred days. 9. The device ...