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Aim: What is an Electric Field? Do Now: What does the word field mean to you?

Learn about electric fields, how they are mapped, their mathematical representation, the relationship between field strength and potential difference, and their practical application.

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Aim: What is an Electric Field? Do Now: What does the word field mean to you?

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  1. Aim: What is an Electric Field?Do Now: What does the word field mean to you?

  2. What is an Electric Field? • A region in space in which an electrostatic force acts on a charge • Exists around every charged object • Mapped by drawing field lines (indicate the direction of the electrostatic force on a + test charge placed in a field.) • It is a vector quantity

  3. Equation • Magnitude is equal to the force exerted per unit charge at that point in the electric field. • What does this translate to mathematically?

  4. E=F/q • Where: • E is the magnitude of the electric field • F is the magnitude of the force • q is the magnitude of the charge

  5. Units • F is measured in Newtons • q is measured in Coulomb’s • What will E be measured in then? • F/q = Newtons/Coulomb’s = E

  6. What is the magnitude of the electrostatic force experienced by one elementary charge at a point in the electric field where the electric field intensity is 3.0 x 103 N/C?

  7. B + A Drawing Electric Field Lines Point A is 1 meter from sphere, so E = 9 N/C Point B is 3 meters from sphere, so E = ?

  8. Based on your answer from the previous slide, where is E stronger? • E α 1/d2 E d

  9. + + + + + + + + + + + + + + + + E = 0 inside Charged conducting sphere

  10. Between 2 parallel charged plates - - - - - - - - B C A + + + + + + + + What is E for each point?

  11. What is the Relationship between field strength and potential difference? Do Now: Fill out the scantron for the Winter Break Assignment HW: Quiz tomorrow on Coulomb’s Law and Electric Fields

  12. Charged Particle Behavior - - - - - - - +q v + + + + + + + Curved path due to electric field on charged particle Older TV’s and inkjet printers use this technology

  13. Electric Work Existing Electric Field F +q d Fe If we push a charge opposite the field direction, work is done WE = F·d Since W = ΔPE, the charge has more potential energy at the final location.

  14. Relationship between Electric Field Strength and Electric Potential Difference V = W/q W = F·d for a constant Force (constant field) V = F·d/q F/q = E V = Ed

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