Chapter 18 review

    Standardized test practice
    1. Which is true of Earth’s north magnetic pole?
      1. It is located near the geographic north pole.
      2. It is located at the geographic north pole.
      3. It is located near the geographic south pole.
      4. It is located at the geographic south pole.

    2. What is the correct application for an electroscope?
      1. to trace a magnetic field
      2. to detect the presence of electric charge
      3. to measure electric current
      4. to take an image of electricity

    3. A student rubbed two nonmetal rods, each of a different material, with two different cloths. He found that the two rods then attracted each other. What is the most likely explanation?
      1. The combination of rods and cloths put positive charges onto one rod and negative charges onto the other.
      2. The combination of rods and cloths put positive charges onto both of the rods.
      3. The combination of rods and cloths put negative charges onto both of the rods.
      4. Both rods were neutral.

    4. What is the strength of the electric force between two charges, each of charge +1 μC, separated by 1 cm?
      1. 0.009 N
      2. 90 N
      3. 9×109 N
      4. 9×1025 N

      5. If four charges are placed at the corners of this square, then how will a positive charge in the middle move?
    5. Four charges are placed on the corners of a rectangle as shown. If a positive charge is placed exactly at the center of the rectangle, what would happen to it?
      1. It will move upward.
      2. It will not move.
      3. It will move diagonally to the lower right corner.
      4. It will move to the right.

      Force field diagram for question
    1. In the figure, what is the sign of the charges Q1 and Q2, respectively?
      1. positive and positive
      2. positive and negative
      3. negative and positive
      4. negative and negative

    2. Which of the following does not create a force field?
      1. gravitational force
      2. centrifugal force
      3. electric force
      4. magnetic force

    3. Which of the following can be used to detect the presence of a magnetic field?
      1. a compass needle
      2. iron filings
      3. a bar magnet

      1. I only
      2. II only
      3. I and II only
      4. I, II, and III

    4. The force between similar magnetic poles is repulsive.

      In this sentence, the word “similar” means:
      1. looks the same.
      2. is about the same size.
      3. has the same magnetic polarity.
      4. is equidistant from all other magnets.

    5. Which of the following is not true?
      1. A resistor dissipates energy.
      2. A capacitor generates energy.
      3. The electric field is related to electric charge.
      4. A battery stores chemical energy.

    6. If the distance between two positive charges increases by a factor of 2, what happens to the force between those charges?
      1. It decreases by a factor of 2.
      2. It does not change.
      3. It increases by a factor of 4.
      4. It decreases by a factor of 4.

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