Chapter 22

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 A. F. B. 2 F. C. F/2. D. F/4. E. None of these

A. F

Two charged particles repel each other with a force F. If the charge of both particles is tripled and the distance between them is also tripled, then the force will be A. F. B. 2 F. C. F/2. D. F/4. E. None of these

A. F

If you rub an inflated balloon against your hair and place the balloon against the wall it will stick to the wall, illustrating A. Coulomb's law. B. conduction and insulation. C. charge polarization. D. voltage

C. charge polarization

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 A. F/q. B. 4F/q. C. F/(2q). D. F/(4q). E. None of these

A. F/q

An uncharged pith ball is suspended by a nylon fiber. When a positively-charged rubber rod is brought nearby, the pith ball A. moves toward the rod. B. is unaffected. C. moves away from the rod. D. None of these

A. moves towards the rod

An uncharged pith ball is suspended by a nylon fiber. When a negatively-charged rubber rod is brought near the pith ball, without touching, the ball A. becomes charged by induction. B. becomes polarized. C. is repelled by the rod. D. is unaffected. E. None of these

B. becomes polarized

Normally a small party balloon charged to several thousand volts will have a relatively small amount of A. charge. B. energy. C. both of these D. neither of these

B. both of these

The primary purpose of a lightning rod is to A. attract lightning and guide it to the ground. B. discharge the structure to which it is attached. C. cancel the electric field within the structure to which it is attached. D. induce a charge opposite to that of charged clouds overhead

B. discharge the structure to which it is attached

It is said that electric charge is quantized, which means that the charge on an object A. may occur in an infinite variety of quantities. B. is a whole-number multiple of the charge of one electron. C. will interact with neighboring electric charges. D. can be neither created nor destroyed. E. is sometimes positive.

B. is a whole-number multiple of the charge of one electron

Two charged particles repel each other with a force F. If the charge of one of the particles is doubled and the distance between them is also doubled, then the force will be A. F. B. 2 F. C. F/2. D. F/4. E. None of these

C. F/2

A reason for electric shielding inside a conductor is that any free electrons inside would A. not obey the inverse-square law. B. cancel one another. C. be set in motion until equilibrium is established, on the outside. D. All of these E. None of these

C. be set in motion until equilibrium is established, on the outside

Electric potential, measured in volts, is the ratio of electric energy to the amount of electric A. current. B. resistance. C. charge. D. voltage. E. None of these

C. charge

Much of the charge on a conducting cube is A. uniformly spread over its surface. B. partly beneath the surface. C. mutually repelled toward its corners. D. None of these

C. mutually repelled towards its corners

A transistor is an example of a A. resistor. B. superconductor. C. semiconductor. D. dry cell. E. transmitter

C. semiconductor

The direction of an electric field is the direction of the force exerted on A. a neutral test charge. B. an electron. C.an atom. D. a proton. E. a molecule

D. a proton

Electric shielding within a conductor is a consequence of A. the balancing of opposing forces. B. both the attraction and repelling nature of electricity. C. cancellation of electric field lines. D. All of these E. None of these

D. all of these

The fundamental force underlying all chemical reactions is A. gravitational. B. nuclear. C. centripetal. D. electrical. E. None of these

D. electrical

The electric field inside the dome of a Van de Graaff generator depends on the A. amount of external charge. B. volume of the dome. C. amount of charge and volume of the dome. D. None of these

D. none of these

A conductor differs from an insulator in that a conductor has more A. electrons than protons. B. protons than electrons. C. energy than an insulator. D. faster moving molecules. E. None of these

E. none of these

Imagine a single charge q placed on one corner of a square, and that the electric field at the center of the square is F/q. If additional equal charges are placed on the other three corners, the electric field at the center of the square due to these four equal charges is A. F/q. B. 4F/q. C. F/(2q). D. F/(4q). E. None of these

E. none of these

Two charged particles repel each other with a force F. If the charge of one of the particles is doubled and the distance between them is halved, then the force will be A. F. B. 2 F. C. F/2. D. F/4. E. None of these

E. none of these