chp 22

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) 0.11 N. B) 0.33 N. C) 0 N. D) 3 N. E) 9 N

A) 0.11 N.

The electrical force between charges is strongest when the charges are A) close together. B) far apart. C) either of these D) need more information

A) close together.

A proton and an electron are placed in an electric field. Which undergoes the greater acceleration? A) electron B) proton C) both accelerate equally. D) none of the above

A) electron

In an electrically neutral atom the number of protons in the nucleus is equal to the number of A) electrons that surround the nucleus. B) neutrons in the nucleus. C) both electrons and neutrons. D) none of the above

A) electrons that surround the nucleus.

A positive charge and a negative charge held a certain distance apart are released. As they move, the force on each particle A) increases. B) decreases. C) stays the same

A) increases.

If electrons are stripped from an atom it becomes a A) positive ion. B) negative ion. C) different element. D) molecule.

A) positive ion.

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.

Which of these has the greatest mass? A) proton B) electron C) both of these D) neither of these

A) proton

Although the energy per coulomb of a high-voltage party balloon is high, the energy transfer that occurs if you touch it is low due to A) the relatively small amount of charge. B) rubber being a poor conductor. C) the small electric potential. D) all of the above

A) the relatively small amount of charge.

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

A) uniform.

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

B) 10 V.

The electrical force on a 2-C charge is 60 N. The electric field where the charge is located is A) 20 N/C. B) 30 N/C. C) 60 N/C. D) 120 N/C. E) 240 N/C.

B) 30 N/C.

Two protons attract each other gravitationally and repel each other electrically. The stronger of these two forces is A) gravitation. B) electrical. C) neither of these

B) electrical.

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

B) gain an electron.

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.

To say that an object becomes electrically polarized means that A) it is electrically charged. B) its charges have been rearranged. C) its internal electric field is zero. D) it is only partially conducting. E) none of the above

B) its charges have been rearranged.

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

B) loose outer electrons.

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

B) negatively charged.

Before a thunder storm, clouds in the sky likely become A) conducting. B) polarized. C) grounded. D) a field-free region.

B) polarized.

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

B) repel or attract.

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

B) the same.

The vast numbers of electrons in a coin don't fly off the surface because A) mutual repulsion is incomplete. B) they are attracted by an equal number of protons. C) they are strongly bonded to their atoms. D) all of the above E) none of the above

B) they are attracted by an equal number of protons.

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) less than zero. B) zero. C) greater than zero.

B) zero.

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 A) zero. B) 5 J. C) 10 J. D) more than 10 J. E) need more information

C) 10 J.

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

C) 4 N.

A common naturally-polarized bit of matter is A) an electron. B) a hydrogen atom C) a water molecule. D) all of the above E) none of the above

C) a water molecule.

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

C) absence of electric resistance.

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 the above E) none of the above

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

Electric charge distributes itself on conducting surfaces A) with greater concentration on more curved parts. B) such that the electric field inside is zero. C) both of the above D) none of the above

C) both of the above

A fundamental rule of electricity is that A) like kinds of charges repel. B) unlike kinds of charges attract. C) both of these D) neither of these

C) both of these

A semiconductor can be A) a conductor. B) an insulator. 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

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 the above

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 the above

C) mutually repelled toward its corners.

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

C) neutron

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

C) zero.

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.

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

D) all of the above

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

D) electrical.

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

D) net charge has been created or destroyed.

Two charges that are separated by one meter exert 1-N forces on each other. If the charges are pushed together so the separation is 25 centimeters, the force on each charge will be A) 1 N. B) 2 N. C) 4 N. D) 8 N. E) 16 N

E) 16 N

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 the above

E) none of the above

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 the above

E) none of the above