Fundamental Concepts of Electrostatics: Coulomb's Law

Coulomb's Law: The magnitude of each of the electrical forces that interact with two point charges at rest is directly proportional to the product of the magnitude of both charges and inversely proportional to the square of the distance that separates them. Coulomb's law is valid only in stationary conditions, ie when there is movement of charge or, as an approximation when the movement takes place at low speeds and in uniform rectilinear trajectories. That is why it is called electrostatic force.

The magnitude of this force is worth: F = K • Qq / r ²

The value of CTE of proportionality K depends on the chosen system of units and the medium interposed between the load. It is, tannate, a universal constant. If the charges are in vacuum and used the SI, the better cte: K = 9.10 ⁹ Nm ² C ^-2.

Physically, this cte represents the force that will repel two charges of one coulomb each located a meter away. Watch the heat so high that you have: equals approx. Weight of 15 million people.

to determine the direction and sense of the interaction force between two charges electostática using the directional vector or unit vector _r. This has the same direction as the segment joining the charges and its meaning is out.

Charging unit: The coulomb is defined as the amount of electric charge flowing through a conductor section for a second when the intensity of current passing through it is one ampere.

Electric field means a charge Q changes the properties of the space around it, causing a pertubacion able to act on other states cargas.Se q in that region of space there exists an electric field created by charge Q, as the electric field is a field conservative force will also have a potential energy for each point of the field. intensity electric field on one point: the electric field intensity at a point k is the force exerted by the field on a charge of one coulomb in that punto.Ê = ^ F / Q e = K (Q / r ^ 2) * UR. superposition principle: when tenems a series of charges situated at various points, the electric field I at one point because of loads that sistemea is equal to the sum of ls intensities fields due to each. Line of forces: as the electric field is a force field is represented graphically by lines called lines always go fuerzas.Estas loads + loads and end in -. Potential at a point electric field. E _p: potncial at a point is the potential energy that has a C positioned at the point V = E _p / associated with an electric q.EP sist of point charges: If V1 is the electric potential Q1 cargo wing because at the point P, then the work required to carry a charge from infinity Q2 pole point P is V1 * Q2. By definition this work is the debut EP iwal sist of 2 point charges when they are separated at a distance R1, 2 EPsist = U = Q2 * V1 = k * Q1 * Q2/r1, 2.