| Force between two charges | Q1 x Q2 / 4 x pi x permittivity of free space x r |
| Electric field strength short version | F / q Nc^-1
Force / Charge |
| Energy with voltage and distance | E = v / d |
| What is the force equal to, also known as inverse square law | k x Q1 xQ2 /r^2
(1/4pi x Constant of proportionality) x Charge1 x Charge2 / distance between two points^2 |
| What is k | k = 1/4pi x permittivity of free space
k = 9x10^9 |
| Coulombs laws | When charged particles act on each other
The force is proportional to the product of their charges
The force is inversely proportional to the square of the distance between two points |
| What shape is the electrical field of two oppositely charged plates | Uniform between plates, on either side one that curves |
| A point charge or a charged sphere emits what kind of electrical field | A radial field |
| What direction are equipotential lines | At a right angle to the field. so in a circle for a radial field, or in a direction parallel (except at far ends where it curves out) to opposite charged plates |
| What is a equipotential line | A way to visualise where every point on said line is the same electric potential |
| What is a electrical field doing | Exerting a force on nearby charged particles. |
| Electric field strength long version, in a radial field | E = Q / 4pi x permittivity of free space x r^2
or
k x Q / r^2 |
| Electric potential energy | V = Q / 4 x pi x r
or
V = k x Q /r |
| Field strength, potential gradient | E = change in v / change in r
E = change in voltage / change in distance |
| Work done, Electric waves | Q x v |
| Distance between two charges | k x Q1 x Q2 / Ep
Ep = kinetic energy |
