Physics

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Homework for CH. 22

Answer all the questions in full details for full credit

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1) Two charges that are separated by one meter exert 1-N forces on each other. If the magnitude of each charge is doubled, the force on each charge is

  1. A) 1 N.
  2. B) 4 N.
  3. C) 2 N.
  4. D) 8 N.
  5. E) none of the above

2) Two charged particles attract each other with a force F. If the charges of both particles are doubled, and the distance between them also doubled, then the force of attraction will be

  1. A) 2 F.
  2. B) F.
  3. C) F/2.
  4. D) F/4.
  5. E) none of the above

3) The electrical force on a 2-C charge is 60 N. The electric field where the charge is located is

  1. A) 60 N/C. B) 20 N/C. C) 240 N/C. D) 30 N/C. E) 120 N/C.

 

4) The electric field around an isolated electron has a certain strength 1 cm from the electron. The electric field strength 2 cm from the electron is

  1. A) four times as much.
  2. B) twice as much.
  3. C) the same.
  4. D) half as much.
  5. E) none of the above

5) Imagine a single charge q placed at one corner of a square, and that the electric field at the center of the square is F/q. If two other equal charges are placed at the adjacent corners of the square (leaving the opposite corner “blank”), the electric field at the center of the square is

  1. A) F/(2q).
  2. B) F/q.
  3. C) F/(4q).
  4. D) 4F/q.
  5. E) none of the above

6) If 10 J of work is used in pushing 1 C of charge into an electric field, its electric potential relative to its starting position is

  1. A) 10 V. B) less than 10 V.
  2. C) more than 10 V D) none of the above

7) Assume that 10 J of work pushes a charge initially at rest into an electric field. If the charge is then released, it flies back to its starting position with a kinetic energy of

  1. A) more than 10 J.
  2. B) zero.
  3. C) 10 J.
  4. D) 5 J.
  5. E) need more information.

 

8) Lillian safely touches a 100,000-volt Van de Graaff generator. Although the voltage is high, the relatively small amount of charge means a relatively small amount of

  1. A) electric field. B) energy transfer. C) conduction. D) polarization.