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1. 2. 3. 4. 5. A point charge {image} is placed at the origin. A second charge, {image} , is placed on the {image} axis at {image} . If {image} , what is the magnitude of the electrostatic force on a third point charge, {image} , placed on the {image} axis at {image} ?. {image} {image}

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  1. 1. 2. 3. 4. 5. A point charge {image} is placed at the origin. A second charge, {image} , is placed on the {image} axis at {image} . If {image} , what is the magnitude of the electrostatic force on a third point charge, {image} , placed on the {image} axis at {image} ? • {image} • {image} • {image} • {image} • {image}

  2. 1. 2. 3. 4. 5. A point charge {image} is placed on the {image} axis at {image} , and a second charge {image} is placed on the {image} axis at {image} . What is the magnitude of the electric force on a third charge {image} placed on the {image} axis at {image} ? • {image} • {image} • {image} • {image} • {image}

  3. 1. 2. 3. 4. 5. Three identical point charges {image} are placed at the vertices of an equilateral triangle (length of each side = 2.4 m). If {image} , what is the magnitude of the electrostatic force on any one of the charges? • {image} • {image} • {image} • {image} • {image}

  4. 1. 2. 3. 4. 5. Three point charges, two positive and one negative, each having a magnitude of {image} are placed at the vertices of an equilateral triangle (28 cm on a side). What is the magnitude of the electrostatic force on one of the positive charges? • {image} • {image} • {image} • {image} • {image}

  5. 1. 2. 3. 4. 5. A charge of {image} is placed on the {image} axis at {image} and a {image} charge is placed on the {image} axis at {image} . If both charges are held fixed, what is the magnitude of the initial acceleration of an electron released from rest at the origin? • {image} • {image} • {image} • {image} • {image}

  6. 1. 2. 3. 4. 5. A {image} charge is positioned on the {image} axis at {image} . Where should a {image} charge be placed to produce a net electric field of zero at the origin? • {image} • {image} • {image} • {image} • {image}

  7. 1. 2. 3. 4. 5. Each of two small non-conducting spheres is charged positively, the combined charge being {image} . When the two spheres are 70 cm apart, each sphere is repelled from the other by a force of magnitude 4.0 N. Determine the magnitude of the smaller of the two charges. • {image} • {image} • {image} • {image} • {image}

  8. 1. 2. 3. 4. 5. A particle ( {image} , {image} ) is released from rest when it is {image} from a second particle {image} . Determine the magnitude of the initial acceleration of the 54-g particle. • {image} • {image} • {image} • {image} • {image}

  9. 1. 2. 3. 4. 5. A charge of {image} is placed on the {image} axis at {image} . A second charge of {image} is placed on the {image} axis at {image} . What is the magnitude of the electrostatic force on a third charge of {image} placed on the {image} axis at {image} ? • {image} • {image} • {image} • {image} • {image}

  10. Two identical pith balls supported by insulating threads hang side by side and close together, as shown below. {applet} • some of the field lines leaving the positively charged pith ball end on the neutral pith ball • all field lines leaving the positively charged pith ball end on the neutral pith ball • none of the field lines leaving the positively charged pith ball end on the neutral pith ball • positive charge is transferred along the field lines until both balls have equal charges • positive charge is transferred along the field lines until both balls hang along vertical lines

  11. 1. 2. 3. 4. 5. If {image} , {image} , and {image} in the figure, what is the magnitude of the electric field at point P? {applet} • {image} • {image} • {image} • {image} • {image}

  12. 1. 2. 3. 4. 5. If {image} , {image} , {image} , {image} , and {image} in the figure, what is the magnitude of the total electric force on {image} ? {applet} • {image} • {image} • {image} • {image} • {image}

  13. 1. 2. 3. 4. 5. A uniform linear charge of {image} is distributed along the {image} axis from {image} to {image} . Which of the following integrals is correct for the magnitude of the electric field at {image} on the {image} axis? • {image} • {image} • {image} • {image} • none of these

  14. 1. 2. 3. 4. 5. A {image} charge is distributed uniformly along the {image} axis from {image} to {image} . Which of the following integrals is correct for the {image} component of the electric field at {image} on the {image} axis? • {image} • {image} • {image} • {image} • none of these

  15. 1. 2. 3. 4. 5. Which one of the diagrams below is not a possible electric field configuration for a region of space which does not contain any charges? • {applet} • {applet} • {applet} • {applet} • {applet}

  16. 1. 2. 3. 4. 5. A negatively charged particle is moving in the +y-direction when it enters a region with a uniform electric field pointing in the +x-direction. Which of the diagrams below shows its path while it is in the region where the electric field exists? The region with the field is the region between the plates bounding each figure. The field lines always point to the right. The x-direction is to the right; the y-direction is up. • {applet} • {applet} • {applet} • {applet} • {applet}

  17. The symbol {image} appears in Coulomb's law because we use independently defined units for _____ . • force, distance and electric charge • force • distance • force and distance • charge and distance

  18. 1. 2. 3. 4. 5. A uniform linear charge of {image} is distributed along the {image} axis from {image} to {image} . Which of the following integrals is correct for the {image} component of the electric field at {image} on the {image} axis? • {image} • {image} • {image} • {image} • none of these

  19. Rubber rods charged by rubbing with cat fur repel each other. Glass rods charged by rubbing with silk repel each other. A rubber rod and a glass rod charged respectively as above attract each other. What is a possible explanation? • A rubber rod and a glass rod charged this way have opposite charges on them. • Any two rubber rods charged this way have opposite charges on them. • Any two glass rods charged this way have opposite charges on them. • All rubber rods always have an excess of positive charge on them. • All glass rods always have an excess of negative charge on them.

  20. 1. 2. 3. 4. 5. A positive charge {image} is placed in the field created by two other charges {image} and {image} , each a distance {image} away from {image} . What is the direction of the acceleration of {image} ? • the direction determined by the vector sum of the electric fields of {image} and {image} • toward {image} or {image} whichever charge has smaller magnitude • toward {image} or {image} whichever charge has greater magnitude • toward the negative charge if {image} and {image} are of opposite sign • toward the positive charge if {image} and {image} are of opposite sign

  21. 1. 2. 3. 4. 5. A uniformly charged rod (length = 2.1 m, charge per unit length = 2.3 nC/m) is bent to form a semicircle. What is the magnitude of the electric field at the center of the circle? • {image} • {image} • {image} • {image} • {image}

  22. 1. 2. 3. 4. 5. A uniformly charged rod (length = 2.1 m, charge per unit length = 4.8 nC/m) is bent to form one quadrant of a circle. What is the magnitude of the electric field at the center of the circle? • {image} • {image} • {image} • {image} • {image}

  23. 1. 2. 3. 4. 5. Charge {image} is distributed uniformly along a semicircle of radius {image} . Which formula below gives the correct magnitude of the force on a particle of charge {image} located at the center of the circle? • {image} • {image} • {image} • {image} • {image}

  24. 1. 2. 3. 4. 5. Charge {image} is distributed uniformly along a semicircle of radius {image} . Which formula below gives the correct magnitude of the electric field at the center of the circle? • {image} • {image} • {image} • {image} • {image}

  25. 1. 2. 3. 4. 5. A particle ( {image} , {image} ) moves in a uniform electric field of 69 N/C in the positive x direction. At {image} , the particle is moving 30 m/s in the positive x direction and is passing through the origin. Determine the maximum distance beyond {image} the particle travels in the positive x direction. • {image} • {image} • {image} • {image} • {image}

  26. 1. 2. 3. 4. 5. A particle ( {image} , {image} ) moves in a uniform electric field of 57 N/C in the positive x direction. At {image} , the particle is moving 25 m/s in the positive x direction and is passing through the origin. How far is the particle from the origin at {image} ? • {image} • {image} • {image} • {image} • {image}

  27. 1. 2. 3. 4. 5. A particle ( {image} , {image} ) has a velocity of 18 m/s in the positive x direction when it first enters a region where the electric field is uniform (60 N/C in the positive y direction). What is the speed of the particle 4.5 s after it enters this region? • {image} • {image} • {image} • {image} • {image}

  28. 1. 2. 3. 4. 5. A charge (uniform linear density = {image} ) is distributed along the {image} axis from {image} to {image} . Determine the magnitude of the electric field at a point on the {image} axis with {image} . • {image} • {image} • {image} • {image} • {image}

  29. 1. 2. 3. 4. 5. A particle (mass = 4.5 g, charge = 33 mC) moves in a region of space where the electric field is uniform and is given by {image} , {image} . If the position and velocity of the particle at {image} are given by {image} and {image} , {image} , what is the distance from the origin to the particle at {image} ? • {image} • {image} • {image} • {image} • {image}

  30. 1. 2. 3. 4. 5. A charge {image} is placed on the {image} axis at {image} . A second charge {image} is located at the origin. If {image} and {image} , what is the magnitude of the electric field on the {image} axis at {image} ? • {image} • {image} • {image} • {image} • {image}

  31. 1. 2. 3. 4. 5. If {image} , {image} , {image} , and {image} , what is the magnitude of the electric field at point P in the figure? {applet} • {image} • {image} • {image} • {image} • {image}

  32. 1. 2. 3. 4. 5. A particle (mass = 3.8 g, charge = 88 mC) moves in a region of space where the electric field is uniform and is given by {image} , {image} . If the velocity of the particle at {image} is given by {image} , {image} , what is the speed of the particle at {image} ? • {image} • {image} • {image} • {image} • {image}

  33. 1. 2. 3. 4. 5. If {image} , {image} , {image} , and {image} , what is the magnitude of the electric field at point P? {applet} • {image} • {image} • {image} • {image} • {image}

  34. 1. 2. 3. 4. 5. If {image} and {image} , what is the magnitude of the electrostatic force on any one of the charges shown? {applet} • {image} • {image} • {image} • {image} • {image}

  35. Three pith balls supported by insulating threads hang from a support. We know that ball X is positively charged. When ball X is brought near balls Y and Z without touching them, it attracts Y and repels Z. What can we conclude? • Y is negatively charged or neutral (has no net charge.) • Y has a negative charge. • Z has a negative charge. • Y has a positive charge. • Z is neutral (has no net charge.)

  36. 1. 2. 3. 4. 5. If {image} , {image} , {image} , {image} , and {image} in the figure, what is the magnitude of the total electric force on {image} ? {applet} • {image} • {image} • {image} • {image} • {image}

  37. If you rub an inflated balloon against your hair, the two materials attract each other, as shown in the figure below. {image} The amount of charge present in the system of the balloon and your hair after rubbing is _____ the amount of charge present before rubbing. • less than • the same as • more than

  38. Three objects are brought close to each other, two at a time. When objects A and B are brought together, they attract. When objects B and C are brought together, they repel. From this, we conclude that _____. • objects A and C possess charges of the same sign • objects A and C possess charges of opposite sign • all three of the objects possess charges of the same sign • one of the objects is neutral • we need to perform additional experiments to determine information about the charges on the objects

  39. 1. 2. 3. 4. 5. 6. Object A has a charge of {image} and object B has a charge of {image} Which statement is true about the electric forces on the objects? • {image} • {image} • {image} • {image} • {image} • {image}

  40. Rank the magnitude of the electric field at points A, B, and C shown in the figure below (greatest magnitude first). {image} • A > B > C • A > C > B • B > A > C • B > C > A • C > A > B • C > B > A

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