PHYS Ch 22 Test Yourself

Charge carriers in a metal are electrons rather than protons because electrons are A. loosely bound B. negative C. smaller D. none of the above

A. loosely bound

If you comb your hair and the comb becomes positively charged, then your hair becomes A. negatively charged B. uncharged C. positively charged

A. negatively charged

To say that electric charge is conserved means that no case has ever been found where A. net charge has been created or destroyed B. the total charge on an object has changed C. the total quantity of charge on an object has increased D. quantity of negative charge on an object exactly balances positive charge E. none of the above

A. net charge has been created or destroyed

A negatively-charged rod is held near an aluminum can that rests on a dry wood table. If you momentarily touch the opposite side of the can with your finger, the can becomes A. positively charged B. negatively charged C. partially discharged D. completely discharged E. none of the above

A. positively charged

When a car is struck by lightning, the resulting electric field inside the car is A. zero B. small enough to be safe for a passenger inside C. normally huge, but for a brief time

A. zero

Two charges separated by one meter exert 1-N forces on each other. If the charges are pulled 3 meters apart, the force on each charge will be A. 0.33 N B. 0.11 N C. 9 N D. 0 N E. 3 N

B. 0.11 N

Superconductors are noted for their A. low electric resistance B. absence of electric resistance C. low cost.bright colors D. high electric resistance

B. absence of electric resistance

Particle A has twice the charge of nearby particle B. Compared to the force on Particle A, the force on Particle B is A. twice as much B. the same C. four times as much D. half as much E. none of the above

B. the same

The electric field between oppositely-charged parallel plates is A. stronger at the ends B. uniform C. composed of field lines in opposite directions D. none of the above

B. uniform

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

D. all of the above

Electrons can be transferred from one place to another by the process of A. friction B. induction, which means non-touching C. contact, which means touching D. all of the above E. none of the above

D. all of the above

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. voltage D. charge polarization

D. charge polarization

The net charge on a charged capacitor depends on A. the medium between the capacitor plates B. the area of the capacitor plates C. the distance between the capacitor plates D. all of the above E. none of the above

E. none of the above

The unit of electric charge, the coulomb, is the charge on a A. neutron B. quark C. single electron D. specific number of neutrons E. specific large number of electrons

E. specific large number of electrons

Electrostatics is a branch of electricity that focuses on A. electrical force B. electrical charge C. both of these when static D. none of the above

C. both of these when static

A balloon will stick to a wooden wall if the balloon is charged A. negatively B. positively C. either of these D. neither of these

C. either of these

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

C. mutually repelled toward its corners.

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/2 B. F/4 C. 2 F D. F E. none of the above

A. F/2

The pair of protons in the nucleus of a helium atom A. attract a pair of orbiting electrons B. repel orbiting electrons C. both of these D. neither of these

A. attract a pair of orbiting electrons

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 polarized B. is unaffected C. is repelled by the rod D. becomes charged by induction E. none of the above

A. becomes polarized

The fundamental force underlying all chemical reactions is A. electrical B. gravitational C. centripetal D. nuclear E. none of the above

A. electrical

Which of these does NOT have an electrical charge? A. neutron B. proton C. electron D. all of the above E. none of the above

A. neutron

The electric field inside an uncharged metal ball is zero. If the ball is negatively charged, the electric field inside the ball is then A. zero B. less than zero C. greater than zero

A. zero

An electron and a proton A. neither attract nor repel each other B. attract each other C. repel each other

B. attract each other

An electroscope is charged positively as indicated by foil leaves that stand apart. As a negative charge is brought close to the electroscope, the leaves become A. farther apart B. closer together C. motionless

B. closer together

To become a negative ion, an atom must A. lose an electron B. gain an electron C. gain a proton D. lose a proton

B. gain an electron

Two charged particles held a certain distance apart are released. As they move, the acceleration of each decreases. Therefore, their charges have A. opposite signs B. the same sign C. need more information

B. the same sign

An electron is pushed into an electric field where it acquires a 1-V electrical potential. If two electrons are pushed the same distance into the same electric field, the electrical potential of the two electrons is A. 4 V B. 0.25 V C. 1 V D. 0.5 V E. 2 V

C. 1 V

Every isolated proton in the universe is surrounded by its own A. electric field B. gravitational field C. both of these D. neither of these

C. both of these

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

C. both of these

The electrical force between electric charges depends only on their A. magnitude B. separation distance C. both of these D. neither of these

C. both of these

The operation of a microwave oven makes use of A. The polar nature of water molecules. B. an oscillating electric field. C. flip flopping of polarized molecules. D. all of the above E. none of the above

D. all of the above

Conducting materials are composed of atoms with A. vastly more charge than insulators B. excess neutrons compared with protons C. strong cohesive forces between them D. loose outer electrons

D. loose outer electrons

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 the above

D. none of the above

A positive ion has more A. protons than neutrons B. electrons than protons C. neutrons than protons D. protons than electrons E. electrons than neutrons

D. protons than electrons

A main difference between gravitational and electric forces is that electrical forces A. act over shorter distances B. are weaker C. attract D. repel or attract E. obey the inverse-square law

D. repel or attract

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

D. semiconductor

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

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

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

E. none of the above

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 A. twice as much B. half as much C. four times as much D. the same E. none of the above

E. none of the above