PHYS 1260 Exam 1 DeWitt questions and answers latest update

Electrostatics 1 1) Just as "gravity" is the study of a wide range of gravitational interactions, "electricity" is the study of a wide range of A) electrical charges. B) electrical forces. C) electrical interactions. D) none of the above 2) Electrostatics is a branch of electricity that focuses on A) electrical charge. B) electrical force. C) both of these when static. D) none of the above 3) The force that binds atoms together to form molecules is A) gravitational. B) nuclear. C) electrical. D) centripetal. E) none of the above 4) The fundamental force underlying all chemical reactions is A) gravitational. B) nuclear. C) centripetal. D) electrical. E) none of the above 5) 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 6) An electron and a proton A) attract each other. B) repel each other. C) neither attract nor repel each other. 7) 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 8) 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 9) An electrically charged atom is an A) ion. B) isotope. C) both of these D) neither of these 10) To become a positive ion, an atom must A) lose an electron. B) gain an electron. C) lose a proton. D) gain a proton. 11) It is said that electric charge is conserved, which means that electric charge 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 negative. 12) The unit of electric charge, the coulomb, is the charge on a A) single electron. B) specific large number of electrons. C) neutron. D) specific number of neutrons. E) quark. 13) 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 14) 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. 15) 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 16) The electrical force between electric charges depends only on their A) magnitude. B) separation distance. C) both of these D) neither of these 17) When the distance between two charges is halved, the electrical force between them A) is reduced by 1/4. B) halves. C) doubles. D) quadruples. E) none of the above 18) 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 19) 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. 20) 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 21) 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. 22) Insulating materials are composed of atoms with A) weak cohesive forces. B) tightly bound outer electrons .C) excess protons. D) vastly more charge than conductors. 23) Charge carriers in a metal are electrons rather than protons because electrons are A) negative. B) smaller. C) loosely bound. D) none of the above 24) 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 25) A transistor is an example of a A) resistor. B) superconductor. C) semiconductor. D) dry cell. E) transmitter. 26) A semiconductor can be A) a conductor. B) an insulator. C) both of these D) neither of these 27) Superconductors are noted for their A) high electric resistance. B) low electric resistance. C) absence of electric resistance. D) low cost. E) bright colors. 28) Superconductors most often require A) low operating temperatures. B) high operating temperatures. C) magnets. 29) 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 30) Rub electrons from your hair with a comb and the comb becomes A) negatively charged. B) positively charged. C) discharged. 31) If you comb your hair and the comb becomes positively charged, then your hair becomes A) positively charged. B) negatively charged. C) uncharged. 32) 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. 33) 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 34) 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. 35) 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 36) 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 37) Before a thunder storm, clouds in the sky likely become A) conducting. B) polarized. C) grounded. D) a field-free region.