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Announcements

Announcements. 1 st EXAM TOMORROW!! NO New Homework CQ2: a) 2 x 10 -12 J b) 1 x 10 -12 J CQ10: a) 1/ 3 b ) 1/ 9 28.20: a) 1.0 x 10 3 V b) 7.0 x 10 6 m/s 28.33: a) -248 V b) –(5.39 x 10 4 N/C) ihat 28.22 : -5,800 V 28.26: 1.0 x 10 -8 C 28.68: Office hours…

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Announcements

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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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