Coulomb’s Law of Electrostatics
We begin with the magnitude of the electrostatic force between two point charges q and Q . It is convenient to label one of these charges, q , as a test charge, and call Q a source charge. As we develop the theory, more source charges will be added. If r is the distance between two charges, then the force of electrostatic formula is:
Electric field lines are useful for visualizing the electric field. Field lines begin on positive charge and terminate on negative charge. Electric field lines are parallel to the direction of the electric field, and the density of these field lines is a measure of the magnitude of the electric field at any given point.
We show charge with “q” or “Q” and smallest unit charge is 1.6021 x 10-19 Coulomb (C). One electron and a proton have same amount of charge.
There are many examples of electrostatic phenomena, from those as simple as the attraction of the plastic wrap to your hand after you remove it from a package, and the attraction of paper to a charged scale, to the apparently spontaneous explosion of grain silos, the damage of electronic components during manufacturing, and photocopier & laser printer operation.
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