physics abc about electric fields 02

Physics ABC - About Electric Fields 02

2021-12-19

Coulomb's law content

Coulomb law: The force between two static point charges in a vacuum is proportional to the product of their charges and inversely proportional to the square of their distance. The direction of the force is on their line .

The force between static charges is called electric force, or Coulomb force.

The like electric charges repel each other, and the unlike electric charges attract each other.

Electric Force

FE = k(q1q2) / r^2

k is the constant of electrostatic force.

(k = 8.99 x 10^9)

(unit of k is (N.m^2)/C2)

The Superposition Principle

If the field source is multiple point charges, the electric field intensity at a certain point in the electric field is the vector sum of the electric field intensity generated by each point charge alone at that point. This relationship is called the superposition principle of electric fields.

If there are several point charges in space at the same time, then the electric field intensity at a certain point in space is equal to the vector sum of the electric field intensity generated by each point charge alone. Form a combined electric field.