Coulomb's Law

Coulomb's Law

1. Electric Charge

   • Two tipes
     • Positive Charge
     • Negative Charge
   • Excess Charge
   • Particles with the same sign of electrical charge repel each other, and particles with opposite signs attract each other.

2. Conductors and Insulators

   • Conductors are materials through which charge can move rather freely
     • Electric current is the rate dq/dt at which charge passes a point: i = dq / dt
   • Nonconductors—also called insulators—are materials through which charge cannot move freely

3. Coulomb’s law describes the electrostatic force (or electric force) between two charged particles. If the particles have charges q1 and q2, are separated by distance r, and are at rest (or moving only slowly) relative to each other, then the magnitude of the force acting on each due to the other is given by

   • where _____________ ________________ is the permittivity constant
   • The ratio _____ is often replaced with the k
     • electrostatic constant ____________

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