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Important Exam Announcement and Office Hours for Electric Charges and Fields

Attention students! An important exam is scheduled for tomorrow. There is no new homework assigned. Please review the following topics: Electric Charges, Forces, Coulomb’s Law, Electric Field Models, Gauss's Law, Electric Potential, and their applications. Office hours are as follows: Monday and Wednesday from 12:30 PM to 1:30 PM, Tuesday and Thursday from 9 AM to 10 AM, and Friday from 10 AM to 11 AM. Check the Tutorial Learning Center hours for additional support. Prepare well and good luck!

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Important Exam Announcement and Office Hours for Electric Charges and Fields

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  1. Announcements • 1st EXAM TOMORROW!! • NO New Homework CQ2: a) 2 x 10-12 J b) 1 x 10-12J CQ10: a) 1/3 b) 1/9 28.20: a) 1.0 x 103 V b) 7.0 x 106 m/s 28.33: a) -248 V b) –(5.39 x 104 N/C) ihat 28.22: -5,800 V 28.26: 1.0 x 10-8 C 28.68: • Office hours… MW 12:30-1:30 pm TR 9-10 am F 10-11 am • Tutorial Learning Center (TLC) hours: M 8-1 pm, 3-6 pm, W 8-1 pm, 2-6 pm TR 8-6 pm, F 8-2 pm

  2. CH 25 – Electric Charges & Forces Developing a Charge Model Charge Insulators & Conductors Coulomb’s Law The Field Model CH 26 – The Electric Field Electric Field Models E-Field of Multiple Pt. Charges E-Field of a Continuous Charge Distribution E-Fields of Rings, Disks, Planes, & Spheres The Parallel-Plate Capacitor Motion of a Charged Particle in an E-Field Outline… CH 27 – Gauss’s Law • Conductors in Electrostatic Equilibrium CH 28 – The Electric Potential • Electric Potential Energy • The Potential Energy of Point Charges • The Electric Potential • The Electric Potential inside a Parallel-Plate Capacitor • The Electric Potential of a Point Charge • The Electric Potential of Many Charges

  3. Q1 Charges +Q, -Q, and q are placed at the vertices of an equilateral triangle as shown. The total force exerted on charge q is: • toward charge +Q. • toward charge –Q. • away from charge +Q. • at right angles to the line joining +Q and –Q. • parallel to the line joining +Q and –Q. +q +Q -Q

  4. Q2 Positive charge +Q is uniformly distributed on the upper half of a rod and a negative charge –Q is uniformly distributed on the lower half. What is the direction of the electric field at point P, on the perpendicular bisector of the rod? • Up. • Down. • Left • Right. • Up and to the left. +Q P -Q

  5. i.e. 1 Two identical, charged spherical masses of m = 1.00 kg are each attached to a light string of length l = 1.00 m as shown in the figure below. The string makes an angle of 30° with the vertical. What is the charge on each mass? Θ Θ l m, q m, q

  6. i.e. 2 What is the electric field at the location of q1, due to q2and q3? What is the force on charge q1? The rectangle has dimensions given by l = 4.0 m and w = 3.0 m. The charges are q1 = -10μC, q2= 100μC, and q3= 32μC. l q3 q2 w q1

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