Electrostatics

Protons and electrons a. attract each other. b. do not interact. c. repel each other.

a. attract each other

Electric forces can be either repulsive or attractive, whereas gravitational force is always: a. attractive b. repulsive c. both a and b d. neither a nor b

a. attractice Gravity always attracts

The SI unit of charge is the a. coulomb. b. ohm. c. joule. d. ampere. e. newton.

a. coulomb

The fundamental force underlying all chemical reactions is a. electrical. b. gravitational. c. centripetal. d. nuclear. e. none of the above

a. electrical

Electrical forces between charges are strongest when the charges are a. far apart. b. close together. c. The electrical force is constant everywhere.

b. close together

Charging by _____ charges a neutral body by touching it with a charged body; whereas charging by _____ charges an object without touching it with a charged body. a. force, conduction b. conduction, induction c. induction, conduction d. force, induction

b. conduction, induction In charging by conduction, charges travel from a charged to a neutral object. In charging by induction, a charged object pushes like charges out of another object and into the ground.

A/An _____ is a material in which charges will not move easily, whereas a/an _____ is a material that allows charges to move about easily. a. insulator, electroscope b. insulator, conductor c. electroscope, conductor d. conductor, insulator

b. insulator, conductor Chargest move easily through conductors, but are not free to move in insultars

The charge of an electron is a. positive. b. negative. c. Electrons have no charge.

b. negative

_____ forces between charges are enormous in comparison to _____ forces. a. Positive, negative b. Gravitational, electrical c. Electrical, gravitational d. Negative, positive

c. Electrical, gravitational The electrostatic force is much more powerful than the gravitational force

Which of the following statements is true about electric forces? a. Electric forces cause objects to only repel each other. b. Electric forces have no effect on each other. c. Electric forces cause objects to only attract each other. d. Electric forces cause objects to repel or attract each other.

d. Electric forces cause objects to repel or attract each other. Electric forces are repulsive between like charged objects and attractive between objects that possess opposite charges.

_____charges repel, whereas _____ charges attract. a. Negative, positive b. Positive, negative c. Opposite, like d. Like, opposite

d. Like, opposite Charges with the same sign repel. Charges with opposite signs attract

When two bodies are charged, the total charge before and after charging remains the same because of: a. law of induction b. quantization of charges c. Coulomb's law d. conservation of charges

d. conservation of charges When two neutral objects are charged, the total charge remains the same because charges are conserved and are not created or destroyed.

Two like charges a. must be neutrons. b. neutralize each other. c. attract each other. d. repel each other. e. have no effect on each other.

d. repel each other