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Electric Charges and Forces

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Electric Charges and Forces

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    1. Physics 133 Chapter 21 Electric Charges and Forces

    2. Physics 133 Workbook 25.4

    3. Physics 133 Workbook 25.5

    4. Physics 133 Workbook 25.6

    5. Physics 133 Coulomb’s law Point particles Along the line between

    6. Physics 133 Atom Positive core Electron cloud

    7. Physics 133 Triboelectric series Wood Amber Hard Rubber Nickel, Copper Brass, Silver Gold, Platinum Polyester Styrene (Styrofoam) Polyurethane Polyethylene (like Scotch tape) Polypropylene Vinyl (PVC) Silicon Teflon - - - (negative) (List is adapted from Nature’s Electricity, by C. K. Adams) +++ (positive) Human Hands (too moist) Rabbit Fur Glass Human Hair Nylon Wool Fur Lead Silk Aluminum Paper Cotton Steel (neutral)

    8. Physics 133 Insulators and Conductors

    9. Physics 133 Electroscope Predict what will happen if a charged rod is brought near an electroscope.

    10. Physics 133 Electroscope Predict what will happen if a charged rod is brought near an electroscope with an insulator below the top ball.

    11. Physics 133 Workbook 25.12

    12. Physics 133 Can.ans

    13. Physics 133 Workbook 25.19

    14. Physics 133 Board.ans

    15. Physics 133 Board2.ans

    16. Physics 133 Workbook 25.21

    17. Physics 133 Point particles Along the line between Coulomb’s law

    18. Physics 133 Workbook 25.22

    19. Physics 133 Workbook 25.22 (Ans)

    20. Physics 133 Force magnitude: Consider two small balls (1: q1=10 nC, m1=20 mg; 2: q2=5 nC, m2=10 mg) separated by 3 cm. What is the magnitude of the electric force between them? What is the magnitude of the gravitational force between them?

    21. Physics 133 Hanging Charged Masses Construct a free-body diagram for the hanging charged object (it is not moving). Apply Newton's second law to your diagram. Rank the forces (descending):T , F (Q on q), w What happens to orientation of rope if Q ? Q/2? What happens to orientation of rope if w ? w/2?

    22. Physics 133 Electric Force – Superposition (graphical addition) Into which quadrant does the vector point that represents the total force on charge #3?

    23. Physics 133 Electric Force – Superposition (adding components) Find the total force on charge #3. (Hint: Use superposition.)

    24. Physics 133 Electric Force – Superposition (answer)

    25. Physics 133 Unit vector Rectangular: always same direction Polar: different directions for each spot Pick a source charge location. (ball) Students make x, y vector components. Students make r unit vector.

    26. Phys 133 Electric Field

    27. Physics 133 Procedure

    28. Physics 133 Simulation: Electric Field

    29. Physics 133 Understanding Fields (in general)

    30. Physics 133 Vector field worksheet (cont.)

    31. Phys 133 Vector field worksheet (ans)

    32. Physics 133

    33. Physics 133

    34. Physics 133 Do workbook W26.2, 3

    35. Physics 133 Electric Field: point charge

    36. Phys 133 Electric Field (multiple charges)

    37. Physics 133 Do workbook 26.5ac, 7adf

    38. Phys 133 Electric field of a dipole along the y-axis…

    39. Phys 133 Electric field of a dipole along the y-axis…

    40. Physics 133

    41. Physics 133 Vector Field and Field Lines

    42. Physics 133 More Vector Field and Field Lines

    43. Phys 133 Electric Field lines

    44. Phys 133 Charges in an Electric Field

    45. Phys 133 Electric Field of a “blob”

    46. Phys 133 Charge Density

    47. Phys 133 Charge Density ans

    48. Phys 133 Electric Field (continuous distribution)

    49. Physics 133 Strategy

    50. Phys 133 Problem

    51. Physics 133 Problem ans

    52. Phys 133 Problem ans x

    53. Phys 133 Problem ans y

    54. Physics 133 Problem ans complete

    55. Physics 133 Problem 26.49

    56. Physics 133 Problem 26.49 ans

    57. Physics 133 Field of quarter circle of charge

    58. Physics 133 Other charge geometries Line Hoop Disk (from hoops) Plane (from disk)

    59. Physics 133 Field of line (infinite)

    60. Physics 133 Field of h oop, along axis

    61. Physics 133 Field of disk, along axis

    62. Physics 133 Field of plane (“infinite”)

    63. Physics 133 Plane from lots of lines (perpendicular to page)

    64. Physics 133 Parallel-plate Capacitor

    65. Phys 133 Find the electric field inside capacitor

    66. Physics 133

    67. Physics 133 Do Workbook 26.28 & 31

    68. Physics 133 Problem 26.52

    69. Physics 133 Dipole in an Electric Field

    70. Physics 133

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