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20-2 Coulomb’s Law

20-2 Coulomb’s Law. q 1 q 2. F e = k c. r 2. 20-2 Coulomb’s Law. 1780’s Charles Coulomb was experimenting to find how charges create forces The force depends on Charges Distance He found this relationship. k c = Coulomb’s Constant k c = 8.99x10 9 Nm 2 /C 2. 20-2 Coulomb’s Law.

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20-2 Coulomb’s Law

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  1. 20-2Coulomb’s Law

  2. q1q2 Fe = kc r2 20-2 Coulomb’s Law 1780’s Charles Coulomb was experimenting to find how charges create forces The force depends on • Charges • Distance He found this relationship kc = Coulomb’s Constant kc = 8.99x109 Nm2/C2

  3. 20-2 Coulomb’s Law The elementary charge of both protons and electrons are the same. One is + and one is - q = 1.60x10-19 C This is the smallest possible charge. When a particle is charged, it is always a multiple of this number. (It is QUANTIZED)

  4. n + + n e- 20-2 Coulomb’s Law Find the force between the nucleus and an electron and an helium atom if they are separated by 1.00 nm (remember that n=nano=10-9). q1 = 2(1.60x10-19) C q2 = 1.60x10-19 C

  5. 1 2 3 2 m 1 m q1 = - 6 mC q2 = +2 mC q3 = - 3 mC 1 3 What would change if this were the original orientation? 2 20-2 Coulomb’s Law Find the net force on q3

  6. 1 2 3 2 m x q1 = - 6 mC q2 = +2 mC q3 = - 3 mC 20-2 Coulomb’s Law What is the value of x if q2 is in equilibrium?

  7. Conductors and Insulators Conductors – any material that allows charges to flow through it easily. examples: Insulators – a material that does not allow charges to move. examples: Both can be charged. It is the movement of charges that makes them different.

  8. Electroscope Charging by Conduction Objects touch and transfer charges. The object will acquire the same charge as the original charge. Charging by Induction Objects do not touch. The object is grounded while a charge is brought close. The object will acquire the opposite charge.

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