Electric Field Physics Mr Dellamorte Analogy The electric

Electric Field Physics Mr. Dellamorte

Analogy The electric field is the space around an electrical charge just like a gravitational field is the space around a mass.

Electric Field n Space around a charge.

What is the difference?

Electric Field Lines

Electric Field Lines of two Positive Charges

Rule #1 n Electric fields always move away from positive charges. n Electric fields always move towards negative charges n From positive to negative

Rule #2 n More field lines mean increased field strength.

Rule #3 n Electric Field Lines NEVER cross.

Rule #4 n There is a region between 2 like charges that will have no electrical field. (looks like a diamond. )

Electric Field Lines Review 1. Electric fields always move away from positive charges. 2. More field lines mean increased field strength. 3. Electric Field Lines NEVER cross. 4. There is a region between 2 like charges that will have no electrical field. (shaped like a diamond)

Which field is stronger? n. A B

Electric Field Strength, E n E = F/ q n q , positive test charge n E is a vector quantity n Unit: N/C n E is analogous to the gravitational field, g, where g=F/m

Electric Field Strength, E n E = k. Q/d 2 n This is a combination of Coulomb’s Law and the Electrical Field equation. n It allows us to find the electrical field of a charge at different distances. n K = 8. 99 x 109 Nm 2/C 2 n Q = charge In Coulombs (C) n D = distance from charge in meters (m)

Example 1 n A charge of 3µC is used to test the electric field of a central charge of 6 C that causes a force of 800 N. What is the magnitude of the electric field? n Answer: 2. 7 x 108 N/C