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# Electric Field - PowerPoint PPT Presentation

Electric Field. Physics Mrs. Coyle. 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?. Van de Graaff Generator.

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## PowerPoint Slideshow about ' Electric Field' - yasir-molina

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Presentation Transcript

### Electric Field

Physics

Mrs. Coyle

The electric field is the space around an electrical charge

just like

a gravitational field is the space around a mass.

• Space around a charge.

• Builds up static electric charges.

• E = F/ qo

• qo , positive test charge

• E is a vector quantity

• Unit: N/C

• E is analogous to the gravitational field, g, where g=F/m

• 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?

### Electric Field

http://higheredbcs.wiley.com/legacy/college/halliday/0471320005/simulations6e/index.htm?newwindow=true

• Lines that indicate the strength and direction of the electric field.

• The more dense the lines, the stronger the field.

• Electric field vectors are tangent to the curve.

• Simulation

http://online.cctt.org/physicslab/content/applets/pointcharges/elefi_z.htm

Conductors and Electric Fields (under electrostatic conditions)

• “The electric field is zero inside a charged conductor”.

• “Excess charge on an isolated conductor resides on the surface”.

• “Excess charge accumulates on sharp points”.

• Electric field lines meet the conductor perpendicular to the surface of the conductor.

• The electric field is zero inside a charged conductor.

• In a car or

• Outdoors

Which field is stronger? steel bridge?

• A B

Electric Field for a Point Charge steel bridge?

Using E=F/qo and Coulomb’s Law prove:

E = k Q

______

r2

where Q is the central charge.

Example 2 steel bridge?

• A test charge of +3µC is located 5m to the east of a -4µC charge.

• A) Find the electric force felt by the test charge.

• B) Find the electric field at that location.

• Answer: 4.32x10-3 N, 1.44 x 103 N/C along the –x axis.

Example 3 steel bridge?

• If a test charge is moved to a location three times as far as its original location, how does the electric field change?

Example 4 steel bridge?

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

• Answer: 1.8 x 1010 N/C