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Announcements

Announcements. Homework for tomorrow… (Ch . 26 CQs 3 & 4, Probs. 9 & 10) CQ15: 3 F /2 25.60: E 1 =(1.0 x 10 5 N/C) jhat , E 2 =(2.9 x 10 4 N /C) i hat +(2.2 x 10 4 N /C) jhat , E 3 =(5.6 x 10 4 N/C) ihat 25.67: 14° Office hours… MW 12:30-1:30 pm TR 9-10 am

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Announcements

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  1. Announcements • Homework for tomorrow… (Ch. 26 CQs 3 & 4, Probs. 9 & 10) CQ15: 3F/2 25.60: E1=(1.0 x 105 N/C) jhat, E2=(2.9 x 104 N/C) ihat+(2.2 x 104 N/C) jhat, E3=(5.6 x 104 N/C) ihat 25.67: 14° • 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. Chapter 26 The Electric Field (The E-Field of a Continuous Charge Distribution)

  3. Last time… • Dipole Moment • E-field of a dipole on the dipoleaxis • E-field of a dipole in the bisecting plane Notice: r is distance measured from the center of dipole. +q s -q

  4. Picturing the E-Field… Two ways: • Electric Field Vectors • Electric Field Lines

  5. Electric Field Line Rules: • Lines start on + charges and end on – charges. • As lines get closer, fields get stronger. • Arrows point in direction of force on a positive test charge. • Force is tangent to field lines. • Field lines CAN’T cross.

  6. Quiz Question 1 The diagram shows the electric field lines due to two charged metal plates. We can conclude that: • The upper plate is positive and the lower plate is negative. • A + charge at X would experience the same force if it were placed at Y. • A + charge X experiences a greater force than if it were placed at Z. • A + charge at X experiences less force than if it were placed at Z. • A - charge at X could have it’s weight balanced by the electrical force. Y Z X

  7. Charge Densities Point Charge Line Charge Surface Charge + + + + + + + + + + + + + + + + + + + L + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + Area A

  8. i.e. 26.3E-field of a line of charge.. Figure 26.11 shows a thin, uniformly charged rod of length L with total charge Q. Find the electric field strength at radial distance r in the plane that bisects the rod. + + + + + + + + + + + + + + + + + + + r L P

  9. i.e. 26.3E-field of a line of charge.. Figure 26.11 shows a thin, uniformly charged rod of length L with total charge Q. Find the electric field strength at radial distance r in the plane that bisects the rod. • Q: What if the rod becomes infinitely long? + + + + + + + + + + + + + + + + + + + r L P

  10. E-field of a line of an infinite line charge..

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