1 / 10

21-1 Creating and Measuring Electric Fields

21-1 Creating and Measuring Electric Fields. Electric Field. Vector quantity that relates the force exerted on a test charge to the size the test charge Electric charge , q, produces an electric field that is measureable Field Strength: Stronger the force, stronger the field

millie
Télécharger la présentation

21-1 Creating and Measuring Electric Fields

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 21-1 Creating and Measuring Electric Fields

  2. Electric Field • Vector quantity that relates the force exerted on a test charge to the size the test charge • Electric charge ,q, produces an electric field that is measureable • Field Strength: Stronger the force, stronger the field • Field Directions: Away from (+), towards (-)

  3. Equation • E = F on q’ q’ • F = force measured in Newtons (N) • q = charge in Coulombs (C) • E = Field Strength in Newton/Coulombs (N/C).

  4. Example • If a 10 C charge were placed in an electric field of strength 10 N/C, what force would it experience? • E = F/q 10 C x 10 N/C = 100 N

  5. Example • An electric field is to be measured using a positive test charge of 4.0 x 10-5 C. This test charge experiences a force of 0.60 N acting at an angle of 10o. What is the magnitude and direction of the electric field at the location of the test charge? • Known: Unknown • q = +4.0 x 10-5 C E = ??? At 10o • F = 0.60 N at 10o

  6. E = F / q • 0.60 N / 4.0 x 10-5 C • E = 1.5 x 104 N/C at 10o

  7. Electric Field Lines • Strength of field is shown by spacing of lines • Closer together  strong • Far apart  weak • As previously shown, positive outward, negative inward

  8. Electric Fields: 2 or more charges • When there are two or more, the field is the vector sum from individual charges • Lines become more curved • Lines will leave a positive charge and enter a negative charge

  9. Electric Field Lines • Also called lines of force. • Lines are vector quantity with longer vectors from stronger fields. • Lines are spaced closer together where the field is stronger. • Lines go to infinity. • With two or more opposite charges, the lines start at the (+) and go to the (-).

  10. Van de Graff machine • Transfers large amounts of charge from one part of the machine to the top meal terminal • Person touches it becomes charged electrically and the charges repel *stands hair up*

More Related