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Understanding Electric Fields: Strength, Formulas, and Visualization Techniques

This guide provides a comprehensive overview of electric fields, explaining the concepts of point charges and their interactions with test charges. It covers electric field strength, with standard formulas such as E = F/q₀ and E = kq/r². The relationship between electric potential and distance is discussed, along with the significance of electric field lines, which illustrate the direction of force from positive to negative charges. Practical problems help solidify understanding of electric field strength in various scenarios, making this an essential resource for students and enthusiasts alike.

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Understanding Electric Fields: Strength, Formulas, and Visualization Techniques

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Presentation Transcript

  1. ELECTRIC FIELDS

  2. I. Electric Field • Assume you have a point charge somewhere in space. • If you place a tiny point charge (q0), into that space, the electric field will apply a force to that test charge. q0 +

  3. II. Electric Field Strength • FORMULA • F is the force on the test charge. • Unit of Electric Field is a N/C E = F/q0 or E= kq/r2

  4. III. Other Electric Field Formulas • E = V/d • As distance increases from the Charge, the potential, or work decreases. • V= kq/r • The closer you get to a charge, the greater the potential • The bigger the charge the greater the potential

  5. III. Electric Field Lines • Always go from positive to negative. • OR, • Positive away • Negative toward • EXAMPLES • Hey, it is easier to draw them by hand

  6. PROBLEMS • What is the Electric Field strength of a point charge if .0002 N push an electron? • What is the Field strength .02 m from 2.0 x 1015 protons?

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