PHYS20009 Chapter Notes - Chapter 7: Superconducting Magnet, Electrical Network, Subatomic Particle
Document Summary
The word electricity" comes from the word electron". Electric charge: an inherent physical property of a certain subatomic particle that is responsible for an electrical and magnetic phenomena. It is represented by q, and its si units are: coulomb, c. This force is important as it holds atoms together, making it possible for matter to exist. The electric force keeps the electron in its orbit. Corresponding law for this force: coulomb"s law. Coulomb"s law: the force acting on each of 2 charged objects is directly proportional to the net charges of the object. But, it is inversely proportional to the square of the distance between them. So, if the charge increase, the force increases. But, if the distance increases, the force decreases. By newton"s third law of motion, q1 is equal and opposite to q2. If both q1 and q2 have the same charge, then the force is positive. But, if they have different charges, the force is negative.