Question 1

A compass needle tends to

Accepted Answer

A) line up perpendicular to a magnetic field. 
B) line up parallel to a magnetic field. 
C) turn slowly in a constant magnetic field. 
D) point only toward the North Pole. 
A) line up perpendicular to a magnetic field. 
B) line up parallel to a magnetic field. 
C) turn slowly in a constant magnetic field. 
D) point only toward the North Pole.

Question 2

When the voltage across a certain resistance is V, the power delivered is P.If the voltage is doubled to V/2, the power delivered becomes

Accepted Answer

A) P/2. 
B) P/4. 
C)    . 
D)    /4. 
A) P/2. 
B) P/4. 
C)    . 
D)    /4.

Question 3

Relative to the electric force between two protons, the gravitational force between them is

Accepted Answer

A) weaker. 
B) equal in magnitude. 
C) stronger. 
D) Any of these choices could be correct, depending on how far apart the protons are. 
A) weaker. 
B) equal in magnitude. 
C) stronger. 
D) Any of these choices could be correct, depending on how far apart the protons are.

Question 4

Ohm's law

Accepted Answer

A) holds only for metals. 
B) holds for all conducting materials. 
C) is a consequence of conservation of energy. 
D) is a fundamental law of nature. 
A) holds only for metals. 
B) holds for all conducting materials. 
C) is a consequence of conservation of energy. 
D) is a fundamental law of nature.

Question 5

Coulomb's formula F = KQ1Q2/R2 gives the force between two charges in free space.The value of K

Accepted Answer

A) is the same under all circumstances. 
B) is different for positive and negative charges. 
C) depends on the masses of the charged particles. 
D) equals the charge on the electron. 
A) is the same under all circumstances. 
B) is different for positive and negative charges. 
C) depends on the masses of the charged particles. 
D) equals the charge on the electron.

Question 6

The nucleus of an atom

Accepted Answer

A) contains most of the atom's mass. 
B) is nearly as large as the atom. 
C) is electrically neutral. 
D) may contain protons, neutrons, and electrons. 
A) contains most of the atom's mass. 
B) is nearly as large as the atom. 
C) is electrically neutral. 
D) may contain protons, neutrons, and electrons.

Question 7

A magnet does not exert a force on

Accepted Answer

A) an unmagnetized iron bar. 
B) a magnetized iron bar. 
C) a stationary electric charge. 
D) a moving electric charge. 
A) an unmagnetized iron bar. 
B) a magnetized iron bar. 
C) a stationary electric charge. 
D) a moving electric charge.

Question 8

When a current passes through a resistance, the electric energy that is lost

Accepted Answer

A) becomes heat. 
B) becomes magnetic energy. 
C) is returned to the source of the current. 
D) disappears. 
A) becomes heat. 
B) becomes magnetic energy. 
C) is returned to the source of the current. 
D) disappears.

Question 9

Two charges of +Q are 1 cm apart.If one of the charges is replaced by a charge of -Q, the magnitude of the force between them is

Accepted Answer

A) zero. 
B) smaller. 
C) the same. 
D) larger. 
A) zero. 
B) smaller. 
C) the same. 
D) larger.

Question 10

The current with which a transformer is used

Accepted Answer

A) must be dc. 
B) must be ac. 
C) may be either dc or ac. 
D) may be neither dc nor ac. 
A) must be dc. 
B) must be ac. 
C) may be either dc or ac. 
D) may be neither dc nor ac.

Question 11

The electrons in an atom

Accepted Answer

A) are bound to it permanently. 
B) are some distance away from the nucleus. 
C) have more mass than the nucleus. 
D) may be positively or negatively charged. 
A) are bound to it permanently. 
B) are some distance away from the nucleus. 
C) have more mass than the nucleus. 
D) may be positively or negatively charged.

Question 12

A magnet attracts

Accepted Answer

A) all substances. 
B) only iron and iron alloys and repels nothing. 
C) iron and iron alloys and repels other substances. 
D) some substances and repels others. 
A) all substances. 
B) only iron and iron alloys and repels nothing. 
C) iron and iron alloys and repels other substances. 
D) some substances and repels others.

Question 13

Atoms and molecules are normally

Accepted Answer

A) electrically neutral. 
B) negatively charged. 
C) positively charged. 
D) ionized. 
A) electrically neutral. 
B) negatively charged. 
C) positively charged. 
D) ionized.

Question 14

A current-carrying wire is in a magnetic field with the direction of the current parallel to that of the field.

Accepted Answer

A) The wire tends to move parallel to the field. 
B) The wire tends to move perpendicular to the field. 
C) The wire tends to turn until it is parallel to the field. 
D) The wire has no tendency to move or to turn. 
A) The wire tends to move parallel to the field. 
B) The wire tends to move perpendicular to the field. 
C) The wire tends to turn until it is parallel to the field. 
D) The wire has no tendency to move or to turn.

Question 15

Electric charge

Accepted Answer

A) can be subdivided indefinitely. 
B) occurs only in separate parcels of $\pm$1.6 * 10-19 
C) occurs only in separate parcels of $\pm$1 
D) occurs only in separate parcels whose value depends on the particle carrying the charge. 
A) can be subdivided indefinitely. 
B) occurs only in separate parcels of $\pm$1.6 * 10-19 
C) occurs only in separate parcels of $\pm$1 
D) occurs only in separate parcels whose value depends on the particle carrying the charge.

Question 16

An electric iron draws a current of 15 A when connected to a 120-V power source.Its resistance is

Accepted Answer

A) 0.125 ohms. 
B) 8 ohms. 
C) 16 ohms. 
D) 1800 ohms. 
A) 0.125 ohms. 
B) 8 ohms. 
C) 16 ohms. 
D) 1800 ohms.

Question 17

When an observer moves past a stationary electric charge, she detects

Accepted Answer

A) only an electric field. 
B) only a magnetic field. 
C) both an electric and a magnetic field. 
D) Any of these choices, depending on her speed. 
A) only an electric field. 
B) only a magnetic field. 
C) both an electric and a magnetic field. 
D) Any of these choices, depending on her speed.

Question 18

If undisturbed, an electric current in a superconducting wire loop

Accepted Answer

A) will decrease to a stop in a few seconds. 
B) will decrease to a stop in a day or two. 
C) will continue indefinitely. 
D) will gradually increase. 
A) will decrease to a stop in a few seconds. 
B) will decrease to a stop in a day or two. 
C) will continue indefinitely. 
D) will gradually increase.

Question 19

The electric energy stored in a 6-V battery rated at 20 Ah is

Accepted Answer

A) 120 J. 
B) 7.2 kJ. 
C) 12 kJ. 
D) 432 kJ. 
A) 120 J. 
B) 7.2 kJ. 
C) 12 kJ. 
D) 432 kJ.

Question 20

Which of the following statements is correct?

Accepted Answer

A) Electrons carry electric currents. 
B) The motion of electrons produces electric currents. 
C) Moving electrons constitute electric currents. 
D) Electric currents are carried by conductors and insulators only. 
A) Electrons carry electric currents. 
B) The motion of electrons produces electric currents. 
C) Moving electrons constitute electric currents. 
D) Electric currents are carried by conductors and insulators only.

A compass needle tends to

When the voltage across a certain resistance is V, the power delivered is P.If the voltage is doubled to V/2, the power delivered becomes

Relative to the electric force between two protons, the gravitational force between them is

Ohm's law

Coulomb's formula F = KQ₁Q₂/R² gives the force between two charges in free space.The value of K

The nucleus of an atom

A magnet does not exert a force on

When a current passes through a resistance, the electric energy that is lost

Two charges of +Q are 1 cm apart.If one of the charges is replaced by a charge of -Q, the magnitude of the force between them is

The current with which a transformer is used

The electrons in an atom

A magnet attracts

Atoms and molecules are normally

A current-carrying wire is in a magnetic field with the direction of the current parallel to that of the field.

Electric charge

An electric iron draws a current of 15 A when connected to a 120-V power source.Its resistance is

When an observer moves past a stationary electric charge, she detects

If undisturbed, an electric current in a superconducting wire loop

The electric energy stored in a 6-V battery rated at 20 Ah is

Which of the following statements is correct?

The Scientific Method

Motion

Energy

Energy and the Future

Matter and Heat

Waves

The Nucleus

The Atom

The Periodic Law

Crystals, Ions, and Solutions

Chemical Reactions

Organic Chemistry

Atmosphere and Hydrosphere

The Rock Cycle

The Evolving Earth

The Solar System

The Stars

The Universe

Filters

Exam 6: Electricity and Magnetism

A compass needle tends to

When the voltage across a certain resistance is V, the power delivered is P.If the voltage is doubled to V/2, the power delivered becomes

Relative to the electric force between two protons, the gravitational force between them is

Ohm's law

Coulomb's formula F = KQ1Q2/R2 gives the force between two charges in free space.The value of K

The nucleus of an atom

A magnet does not exert a force on

When a current passes through a resistance, the electric energy that is lost

Two charges of +Q are 1 cm apart.If one of the charges is replaced by a charge of -Q, the magnitude of the force between them is

The current with which a transformer is used

The electrons in an atom

A magnet attracts

Atoms and molecules are normally

A current-carrying wire is in a magnetic field with the direction of the current parallel to that of the field.

Electric charge

An electric iron draws a current of 15 A when connected to a 120-V power source.Its resistance is

When an observer moves past a stationary electric charge, she detects

If undisturbed, an electric current in a superconducting wire loop

The electric energy stored in a 6-V battery rated at 20 Ah is

Which of the following statements is correct?

The Scientific Method

Motion

Energy

Energy and the Future

Matter and Heat

Waves

The Nucleus

The Atom

The Periodic Law

Crystals, Ions, and Solutions

Chemical Reactions

Organic Chemistry

Atmosphere and Hydrosphere

The Rock Cycle

The Evolving Earth

The Solar System

The Stars

The Universe

Filters

Coulomb's formula F = KQ₁Q₂/R² gives the force between two charges in free space.The value of K