Electric Field Physics Mrs Coyle Coulombs Law Practice

Electric Field Physics Mrs. Coyle

Coulomb’s Law

Practice Problem n Suppose that two point charges, each with a charge of +1. 00 Coulomb are separated by a distance of 1. 00 meter. Determine the magnitude of the electrical force of repulsion between them.

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?

Van de Graaff Generator n Builds up static electric charges. n https: //www. youtube. com/wat ch? v=r. NEY 3 Yv 9 k. C 8

Electric Field Vector, E n E = F/ qo n qo , 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

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?

Electric Field Lines

Electric Field Lines of two Positive Charges

Electric Field Lines n Lines that indicate the strength and direction of the electric field. n The more dense the lines, the stronger the field. n Electric field vectors are tangent to the curve. n Simulation http: //online. cctt. org/physicslab/content/applets/ pointcharges/elefi_z. htm

Why can you not get radio reception in a tunnel or in a steel bridge?

Which field is stronger? n. A B

Example 2 n A test charge of +3µC is located 5 m to the east of a -4µC charge. n A) Find the electric force felt by the test charge. n B) Find the electric field at that location.

Example 4 n Calculate the electric field felt by a test charge located half way between a charge of +1 C and a charge of -3 C, that are 2 m apart.