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1. ConcepTest 16.1a Electric Charge I

1. ConcepTest 16.1a Electric Charge I. 1) one is positive, the other is negative 2) both are positive 3) both are negative 4) both are positive or both are negative. Two charged balls are repelling each other as they hang from the ceiling. What can you say about their charges?.

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1. ConcepTest 16.1a Electric Charge I

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  1. 1. ConcepTest 16.1aElectric Charge I 1)one is positive, the other is negative 2) both are positive 3) both are negative 4) both are positive or both are negative Two charged balls are repelling each other as they hang from the ceiling. What can you say about their charges?

  2. 2. ConcepTest 16.1bElectric Charge II 1) have opposite charges 2) have the same charge 3) all have the same charge 4) one ball must be neutral (no charge) From the picture, what can you conclude about the charges?

  3. 3. ConcepTest 16.2aConductors I 1) positive 2) negative 3) neutral 4) positive or neutral 5) negative or neutral A metal ball hangs from the ceiling by an insulating thread. The ball is attracted to a positive-charged rod held near the ball. The charge of the ball must be:

  4. 1) 00 2) + – 3) – + 4) + + 5) – – 0 0 ? ? 4. ConcepTest 16.2bConductors II Two neutral conductors are connected by a wire and a charged rod is brought near, butdoes not touch. The wire is taken away, and then the charged rod is removed. What are the charges on the conductors?

  5. F2 = ? F1 = 3N Q Q 5. ConcepTest 16.3aCoulomb’s Law I 1) 1.0 N 2) 1.5 N 3) 2.0 N 4) 3.0 N 5) 6.0 N What is the magnitude of the force F2?

  6. F2 = ? F1 = 3N Q Q F2 = ? F1 = ? 4Q Q 6. ConcepTest 16.3bCoulomb’s Law II 1) 3/4 N 2) 3.0 N 3) 12 N 4) 16 N 5) 48 N If we increase one charge to 4Q, what is the magnitude of F1?

  7. F F Q Q ? ? Q Q d 3d 7. ConcepTest 16.3cCoulomb’s Law III 1) 9 F 2) 3 F 3) F 4) 1/3 F 5) 1/9 F The force between two charges separated by a distance d is F. If the charges are pulled apart to a distance 3d, what is the force on each charge?

  8. +4Q +Q 3R 8. ConcepTest 16.4aElectric Force I 1) yes, but only if Q0is positive 2) yes, but only if Q0is negative 3) yes, independent of the sign (or value) of Q0 4) no, the net force can never be zero Two balls with charges +Q and +4Q are fixed at a separation distance of 3R. Is it possible to place another charged ball Q0 on the line between the two charges such that the net force on Q0 will be zero?

  9. +4Q +Q 1 2 3 5 4 2R R 3R 9. ConcepTest 16.4bElectric Force II Two balls with charges +Q and +4Q are separated by 3R. Where should you place another charged ball Q0 on the line between the two charges such that the net force on Q0 will be zero?

  10. – 4Q +Q 3R 10. ConcepTest 16.4cElectric Force III 1) yes, but only if Q0is positive 2) yes, but only if Q0is negative 3) yes, independent of the sign (or value) of Q0 4) no, the net force can never be zero Two balls with charges +Q and –4Q are fixed at a separation distance of 3R. Is it possible to place another charged ball Q0anywhereon the line such that the net force on Q0 will be zero?

  11. e p 11. ConcepTest 16.5aProton and Electron I 1)it gets bigger 2) it gets smaller 3) it stays the same A proton and an electron are held apart a distance of 1 m and then released. As they approach each other, what happens to the force between them?

  12. e p 12. ConcepTest 16.5bProton and Electron II 1)proton 2) electron 3) both the same A proton and an electron are held apart a distance of 1 m and then released. Which particle has the larger acceleration at any one moment?

  13. e p 13. ConcepTest 16.5cProton and Electron III 1)in the middle 2) closer to the electron’s side 3) closer to the proton’s side A proton and an electron are held apart a distance of 1 m and then let go. Where would they meet?

  14. +2Q 1 2 3 +4Q 4 d +Q 5 d 14. ConcepTest 16.6Forces in 2D Which of the arrows best represents the direction of the net force on charge +Q due to the other two charges?

  15. 15. ConcepTest 16.7Electric Field (1)4E0 (2) 2E0 (3) E0 (4) 1/2E0 (5) 1/4E0 You are sitting a certain distance from a point charge, and you measure an electric field of E0. If the charge is doubled and your distance from the charge is also doubled, what is the electric field strength now?

  16. d d +1 +1 +2 +2 +1 +1 16. ConcepTest 16.8aField and Force I 1) 2) 3) the same for both Between the red and the blue charge, which of them experiences the greater electric field due to the green charge?

  17. d d +1 +1 +2 +2 +1 +1 17. ConcepTest 16.8bField and Force II 1) 2) 3) the same for both Between the red and the blue charge, which of them experiences the greater electric force due to the green charge?

  18. -2 C 1 2 4 3 -2 C 18. ConcepTest 16.9aSuperposition I What is the electric field at the center of the square? 5) E = 0

  19. -2 C -2 C 1 2 4 3 -2 C -2 C 19. ConcepTest 16.9bSuperposition II What is the electric field at the center of the square? 5) E = 0

  20. -Q +Q 2 3 +Q 1 4 5 20. ConcepTest 16.9cSuperposition III What is the direction of the electric field at the position of the X ?

  21. Q1 Q2 y E x 21. ConcepTest 16.10Find the Charges 1) charges are equal and positive 2) charges are equal and negative 3) charges are equal and opposite 4) charges are equal, but sign is undetermined 5) charges cannot be equal Two charges are fixed along the x-axis. They produce an electric field E directed along the negative y-axis at the indicated point. Which of the following is true?

  22. Q 22. ConcepTest 16.11Uniform Electric Field 1)12 N 2) 8 N 3) 24 N 4) no force 5) 18 N In a uniform electric field in empty space, a 4 C charge is placed and it feels an electrical force of 12 N. If this charge is removed and a 6 C charge is placed at that point instead, what force will it feel?

  23. 23. ConcepTest 16.12a Electric Field Lines I 1) 2) 3) 4) 5) no way to tell What are the signs of the charges whose electric fields are shown at right?

  24. 24. ConcepTest 16.12bElectric Field Lines II 1) 2) 3) Both the same Which of the charges has the greater magnitude?

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