# PCC PHY 213 - Electric Fields (4 pages)

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## Electric Fields

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## Electric Fields

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Lecture Notes

Pages:
4
School:
Portland Community College
Course:
Phy 213 - General Physics (calculus)
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Phy213 General Physics III Chapter 22 Worksheet 4 17 2008 1 Electric Fields 1 Consider a fixed point charge of 2 0 C q1 q1 2 0 C P d 0 1 m a What is the magnitude and direction of the electric field at a point P a distance of 0 1 m b A 2nd charge q2 2 0 C is placed at point P What is the magnitude and direction of the electric force exerted on q3 2 Three protons are present in the nucleus of a lithium atom forming an equilateral triangle The distance r between each pair of protons is 1 5 x 10 15 m Lithium Nucleus r a What is the magnitude of the electric field vector due to the lithium nucleus at point P a distance of 2 5x10 10m from the center of the nucleus b What is the magnitude and direction of the total electric force exerted on an electron positioned at point P Phy213 General Physics III Chapter 22 Worksheet 4 17 2008 2 3 Consider an electric dipole q 0 1 C separated by a distance of 5x10 6 m q q P a Sketch the electric field lines for the electric field vector due to the dipole b What is the magnitude and direction of the electric field vector due to the dipole at point P a distance of 0 5 m to the right of the dipole c What is the magnitude and direction of the electric field due to the dipole at a distance of 0 5 m directly above the dipole 4 Consider a uniform line of charge with a total charge of 5 pC and a total length of 0 5 m P a What is the magnitude of the linear charge density b Sketch the field lines for the line of charge in the diagram above c Derive an equation for the electric field vector at point P located 0 3 m above the line and centered between the ends d What is the magnitude of the electric field vector at point P e Determine the electric force vector exerted on an electron placed at point P f What is the acceleration of the electron located at point P Phy213 General Physics III Chapter 22 Worksheet 4 17 2008 3 5 Consider a charged ring with total charge of 2 4 mC and radius of 0 3 m q P a What is the magnitude of the surface charge

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