Chapter 5

The current through a 5.0-Ω resistor is 0.40 A. What is the voltage across the resistor? a) 0.8 V b) 2.0 V c) 4.6 V d) 5.4 V

??

The electrical force between 2 charges has a magnitude of 16N. IF the separation between the charges is doubled, what is the new force actin between them?

???

To achieve a negative charge, you would most likely do which of the following? a) Add protons to the object. b) Add electrons to the object. c) Remove electrons from the object. d) Remove protons from the object.

???

Electric fields and electric currents can be produced by a. changing magnetic fields. b. radiation. c. magnetic monopoles. d. electric eels and sharks. e. static electrical charges.

A

Mary Shelley's Frankenstein was based on some experiments and demonstrations in electricity from a. Galvani's research. b. Voltaire's research. c. the writings of Allessandro Volta. d. Benjamin Franklin's research. e. William Gilbert's compass.

A

Voltage is to resistance as a. volt is to ohm. b. volt is to amp. c. volt is to watt. d. volt is to flow rate. e. volt is to power.

A

Which is not true of Maxwell's equations? a. Like charges attract, unlike charges repel. b. Coulomb's law c. There are no magnetic monopoles in nature. d. Magnetic phenomena can be produced by electrical effects. e. Electrical phenomena can be produced by magnetic effects.

A

n what way does Newton's law of universal gravitation differ from Coulomb's law? a. Electrical forces can be either attractive or repulsive, while gravity is only attractive. b.Only Newton's law of gravity requires a universal constant. c. Only Coulomb's law addresses distance in describing the effect of one object one another. d. All of the above represent differences. e. Newton's and Coulomb's laws are identical.

A

Coulomb's law states that force is dependent on all EXCEPT a. the Coulomb constant. b. the difference in size between the two objects. c. the charge of the smaller object. d. the distance between the two objects. e.the charge of the larger object.

B

Every electrical circuit contains a. an electromagnet. b. a path through which the current can flow. c. a switch. d. a circuit breaker. e. low-resistance wires.

B

Every electrical circuit contains: a) an electromagnet. b) an unbroken flow path. c) an electric switch. d) a circuit breaker.

B

How is the force of two charged particles related to their charges? a. proportional to the product of their charges divided by the cube of the distance between them b. proportional to the product of their charges divided by the square of the distance between them c. proportional to the ratio of their charges divided by the distance between them d. proportional to the ratio of their charges multiplied by the square of the distance between them e. No relation exists between charged particles and force.

B

How much electrical current will flow through a 250-watt stereo system to play a compact disk in the United States? a. 1.14 amps b. 2.17 amps c. 0.46 amps d. 28,750 amps e. You need more data to calculate the current.

B

Static cling is an example of a. the fact that there are no magnetic monopoles. b. Coulomb's Law. c. changing magnetic fields. d. alternating current. e. electromagnetism.

B

Which of the following is something common to both the electrical force and the gravitational force?

Both extend to infinity and travel at the speed of light

A force field surrounding a charged object is a a. gravitational field. b. gravitational force. c. electrical field. d. electrical force. e. magnetic field

C

Hans Christian Oersted discovered the relationship between the forces of magnetism and electricity by a. many long years of tedious research. b. reading the writings of Galvani. c. paying attention during a physics lecture. d. interpreting his dreams. e. replicating the experiments of Volta.

C

The functioning of an electric motor depends on the fact that a. like charges attract, unlike charges repel. b. like magnetic poles attract, unlike magnetic poles repel. c. an electrical current produces a magnetic field. d. permanent magnets are always stronger than electromagnets. e. all motors must have several electromagnets.

C

The newest version of hybrid cars a. use magnetic monopoles. b. incorporate nuclear and electric motors. c. get above 50 miles per gallon on the highway. d. have lead-acid batteries. e. has altered car manufacturers' attitudes.

C

When you cut a magnet in half you get a. two north poles. b. two south poles. c. two north poles and two south poles. d. one magnetic monopole. e. one south pole and one north pole.

C

Which of the following can produce magnetic fields? a. gravitational force b. static electrical force c. moving electrical charges d. increasing entropy e. all of the above

C

Which of the following items would use only low resistance wires? a. a toaster b. a space heater c. an electrical transmission line d. a light bulb e. a hair dryer

C

Which scientist was most influential in Coulomb's work? a. Benjamin Franklin b. James Clerk Maxwell c. Sir Isaac Newton d. Thomas Edison e. Michael Faraday

C

In a famous experiment in the late 1700s, Charles Coulomb a. repeated Benjamin Franklin's kite and lightning demonstration. b. measured electricity with a galvanometer. c. proved Newton's three laws of motion. d. measured the force of the electric charge in objects. e. showed that muscle contractions are both electric and chemical.

D

The load in an electric blow dryer is a. where the dryer plugs into the electrical outlet. b. where the electrical cord is attached to the dryer. c. in the on/off switch. d.in the heating element and fan. e. where the heated air is exhausted.

D

Which of the following is not a property of magnets? a) All magnets have poles b) All magnets can attract an iron nail. c) All magnets' poles come in pairs, a north and a south. d) All magnets are made of steel.

D

William Gilbert discovered many important properties of magnets. Which of the following was not among Gilbert's findings? a. Every magnet has at least two poles. b. If magnetic poles are alike they repel each other. c. Steel rods can be magnetized by stroking them with a lodestone. d. Electric currents can be produced by changing magnetic fields. e. Iron's magnetism can be destroyed by heating.

D

In equation form, Ohm's Law states a. electrical pressure = flow charge/flow resistance b. current = voltage (volts) + flow charge (coulombs) c. power (watts) = current (amps) X voltage (volts) d. voltage (volts) = pressure (ohms) X resistance (ohms) e. voltage (volts) = current (amps) X resistance (ohms)

E

It is possible to make an electric current flow in a loop of wire by a. inserting a battery into the loop. b. static electrical charges. c. moving a magnet near the loop. d. spinning the loop in a magnetic field. e. a & c & d

E

What are some ways the Earth's magnetic field is used for navigation? a. Sailors use compasses to direct their course. b. Some bacteria navigate down within pond ooze. c. Migratory birds are directed by the magnetic field. d. Australian silvereye can see the magnetic fields. e. all of the above

E

What important practical device followed directly from Michael Faraday's work? a. the battery b.the thermostat c. the electromagnet d. the internal combustion engine e. the electric generator

E

n which of the objects below would you find an electromagnet? a. wall switch, buzzer, motors b. thermostats, electric drill, electric fan c. hair dryer, electric razor, power drill d. heater, food processor, CD player e. all of the above

E