PHYS 1260 Exam 1 DeWitt questions and answers ,latest updated

PHYS 1260 Exam 1 DeWitt questions and answers ,latest updated Just as gravity is the study of a wide range of interactions, "electricity" is the study of a wide range of a) electrical charges b) electrical forces c) electrical interactions d) none of the above C 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 C 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 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 Two protons attract each other gravitationally and repel each other electrically. By far the greater force is a) gravitation b) electrical c) neither of these B 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 A When the distance between two charges is halved, the electrical force between the charges a) is reduced by 1/4 b) halves c) doubles d) quadruples e) none of the above D The electrical force between electric charges depends only on their a) magnitude b) separation distance c) both of these d) neither of these B The electrical force on a 2-C charge is 60N. 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 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 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 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 than 10 V d) none of the above B To think of electric potential difference we are thinking about a) current b) voltage c) resistance B An ampere is a unit of electric a) current b) voltage c) resistance A Electrons flow in a wire when there is a) an imbalance of charges in the wire b) a potential difference across its ends c) a difference in potential energy across its ends d) none of the above B A coulomb of charge flowing in a bulb filament powered by a 6-volt battery is provided with a) 6 ohms b) 6 amperes c) 6 joules d) 6 watts e) 6 newtons C The unit of electrical resistance is the a) volt b) ampere c) ohm d) none of the above C The current produced by voltage in a circuit is impeded by a) electric barriers b) closed switches c) electric resistance d) none of the above C Ohm's law tells us that the amount of current produced in a circuit is a) directly proportional to voltage b) inversely proportional to resistance c) both of these d) neither of these C Current in a conductor can be increased by a) increasing the voltage across it b) reducing its resistance c) both of these d) neither of these C When you brush your hair and scrape electrons from your hair, the charge of your hair is positive Electric potential energy is measured in joules. Electric potential is measured in volts True or False: Electric current is a flow of electric charge? true When you double the voltage in a simple electric circuit, you double the current