# ASSIGN1 - Section Name Assignment 1 Electric Forces and...

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Section: ______ Name: ______________________________ Section Instructor: ______________________________ Assignment 1: Electric Forces and Fields Concepts: electric charge Coulomb’s law electric forces conductors and insulators electric fields superposition electric field line model charge in an electric field electric fields near conductors in electrostatic eq. Reading in text: Chapter 21: Sections 1-6. Chapter 22: Sections 1-5, 8, 9. Chapter 25: Section 7. Assignment: Solutions posted on Wednesday, January 31. Quiz may be given on or after Tuesday, February 6. 1. Two positive point charges, each having charge + Q , and two negative point charges, each having charge q , are at the corners of a square of side length D , as shown. (a) Draw a diagram showing the electric forces acting on the upper left + charge. Q (b) What must be the magnitude of q (in terms of Q ) in order for each of the + charges to be in electrostatic equilibrium? Q (c) Derive an expression for the magnitude of the resulting net electric force acting on the upper right q charge (in terms of Q , D , pure numbers (like 2, π , etc.), and any required physical constants such as the electrostatic constant k ). What is the direction of this force? + Q + Q q q D D 2. An electric dipole is shown in the diagram on the last page of this assignment. (a) At each point marked × , carefully construct a vector arrow showing the total electric field at that point due to the dipole.

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