Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Which force binds atoms together to form molecules? 1) _______ A) centripetal B) nuclear C) gravitational D) electrical E) none of these 2) In an electrically neutral atom the number of protons in the nucleus is equal to the number of 2) _______ A) neutrons in the nucleus. B) electrons that surround the nucleus. C) Choices A and B are both correct. D) Choices A and B are both incorrect. 3) The electrical force between charges is strongest when the charges are 3) _______ A) far apart. B) close together. C) The electric force is constant everywhere. 4) When a car is struck by lightning, the resulting electric field inside the car is 4) _______ A) zero. B) small enough to be safe for an occupant inside. C) normally huge for a time longer than the lightning stroke itself. D) normally huge, but for a brief time. Figure 10-A 5) A balloon will stick to a wooden wall if the balloon is charged 5) _______ A) positively. B) negatively. C) either positively or negatively. D) None of the above choices are correct. 6) If you comb your hair and the comb becomes positively charged, then your hair becomes 6) _______ A) negatively charged. B) uncharged. C) positively charged.7) Particle A has twice the charge of nearby particle B. Compared to the force on Particle A, the force on Particle B is 7) _______ A) half as much. B) the same. C) twice as much. D) four times as much. E) None of the above choices are correct. 8) A conductor differs from an insulator in that a conductor 8) _______ A) has faster moving molecules. B) has more electrons than protons. C) has more energy than an insulator. D) has more protons than electrons. E) none of these 9) Charge carriers in a metal are electrons rather than protons because electrons are 9) _______ A) loosely bound. B) smaller. C) negative. D) all of these. E) none of these. 10) The electrical force on a 2-C charge is 60 N. What is the value of the electric field at the place where the charge is located? 10) ______ A) 30 N/C B) 120 N/C C) 60 N/C D) 20 N/C E) 240 N/C 11) The electric field inside an uncharged metal ball is zero. If the ball is negatively charged, the electric field inside the ball is then 11) ______ A) less than zero. B) zero. C) greater than zero. 12) Two charged particles held close to each other are released. As they move, the force on each particle increases. Therefore, the particles must have 12) ______ A) the same size. B) opposite signs. C) the same sign. D) the same mass. E) impossible to answer without additional information 13) A positive charge and a negative charge held near each other are released. As they move, the force on each particle 13) ______ A) stays the same. B) increases. C) decreases.14) A proton and an electron are placed in an electric field. Which undergoes the greater acceleration? 14) ______ A) proton B) electron C) Both accelerate equally. D) Neither accelerates. 15) If a steady magnetic field exerts a force on a moving charge, that force is directed 15) ______ A) opposite the motion. B) in the direction of the motion. C) at right angles to the direction of the motion. 16) Like kinds of magnetic poles repel while unlike kinds of magnetic poles 16) ______ A) repel also. B) attract. C) may attract or repel. 17) The force on an electron moving in a magnetic field will be the largest when its direction is 17) ______ A) exactly opposite to the magnetic field direction. B) at an angle other than 90 degrees to the magnetic field direction. C) perpendicular to the magnetic field direction. D) the same as the magnetic field direction. E) none of these 18) Compared to the huge force that attracts an iron tack to a strong magnet, the force that the tack exerts on the magnet is 18) ______ A) equally huge. B) relatively small. C) More information is needed. 19) Outside a magnet, magnetic field lines are conventionally drawn from 19) ______ A) south to north. B) north to south. C) either way 20) A plastic rod is charged up by rubbing a wool cloth, and brought to an initially neutral metallic sphere. It is allowed to touch the sphere for a few seconds, and then is separated from the sphere by a small distance. After the rod is separated, the rod 20) ______ A) feels no force due to the sphere. B) is attracted to the sphere. C) is repelled by the sphere.21) A hydrogen nucleus, which has a charge e, is situated to the left of a carbon nucleus, which has a charge 6e. Which statement is true? 21) ______ A) The electrical force experienced by the hydrogen nucleus is to the right, and the magnitude is equal to the force exerted on the carbon nucleus. B) The electrical force experienced by the hydrogen nucleus is to the left, and the magnitude is equal to the force exerted on the carbon nucleus. C) The electrical force experienced by the hydrogen nucleus is to the left, and the magnitude is less than the force exerted on the carbon nucleus. D) The electrical force experienced by the hydrogen nucleus is to the left, and the magnitude is greater than the force exerted on the carbon nucleus. 22) A positive test charge q is released near a positive fixed charge Q. As q moves away from Q, it will move with 22) ______ A) increasing acceleration. B) constant velocity. C) constant acceleration. D) decreasing acceleration. 23) X and Y are two uncharged metal spheres on insulating stands, and are in contact with each other. A positively charged rod R is brought close to X as shown in figure 1. Sphere Y is now moved away from X (figure 2). The final charge states of X and Y, respectively, are 23) ______ A) neutral and neutral. B) positive and neutral. C) negative and positive. D) neutral and positive.24) Two equal and opposite charges a certain distance apart are called an
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