Electric Field Physics Mr. Dellamorte.

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Presentation transcript:

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 Space around a charge.

What is the difference?

Electric Field Lines

Electric Field Lines of two Positive Charges

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

Rule #2 More field lines mean increased field strength.

Rule #3 Electric Field Lines NEVER cross.

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

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

Which field is stronger? A B

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

Electric Field Strength, E E = kQ/d2 This is a combination of Coulomb’s Law and the Electrical Field equation. It allows us to find the electrical field of a charge at different distances. K = 8.99 x 109 Nm2/C2 Q = charge In Coulombs (C) D = distance from charge in meters (m)

Example 1 A charge of 3µC is used to test the electric field of a central charge of 6C that causes a force of 800N. What is the magnitude of the electric field? Answer: 2.7 x108 N/C