Question 1

Suppose that the electric force between two objects is 2 N and that you then double the distance between the objects. The new force is

Accepted Answer

A)  1 N. 
B)  8 N. 
C)  0.5 N. 
D)  0.25 N. 
E)  4 N. 
A)  1 N. 
B)  8 N. 
C)  0.5 N. 
D)  0.25 N. 
E)  4 N.

Question 2

Earth's magnetism arises from

Accepted Answer

A)  the Wizard of Oz. 
B)  electric currents in the upper atmosphere. 
C)  charged particles at rest on Earth's surface and on clouds in the lower atmosphere. 
D)  electric currents in Earth's interior. 
E)  electric currents in the sun. 
A)  the Wizard of Oz. 
B)  electric currents in the upper atmosphere. 
C)  charged particles at rest on Earth's surface and on clouds in the lower atmosphere. 
D)  electric currents in Earth's interior. 
E)  electric currents in the sun.

Question 3

All magnetic forces are produced by

Accepted Answer

A)  electromagnetic generators. 
B)  protons. 
C)  charges in motion. 
D)  permanent magnets. 
E)  stationary charges. 
A)  electromagnetic generators. 
B)  protons. 
C)  charges in motion. 
D)  permanent magnets. 
E)  stationary charges.

Question 4

A neutral atom loses one of its electrons. It is then

Accepted Answer

A)  either a negative or positive ion, depending on which electron was lost. 
B)  ashamed of itself. 
C)  a neutral ion. 
D)  a positive ion. 
E)  a negative ion. 
A)  either a negative or positive ion, depending on which electron was lost. 
B)  ashamed of itself. 
C)  a neutral ion. 
D)  a positive ion. 
E)  a negative ion.

Question 5

A blow dryer with a resistance of 6 ohms is plugged into a 60- volt battery. How much current does it draw?

Accepted Answer

A)  0.1 amp 
B)  360 amps 
C)  10 amps 
D)  30 amps 
E)  6 amps 
A)  0.1 amp 
B)  360 amps 
C)  10 amps 
D)  30 amps 
E)  6 amps

Question 6

In an electrical circuit, the number of "amperes" measures the

Accepted Answer

A)  voltage around the circuit. 
B)  amount of energy given to each coulomb of electrical charge. 
C)  amount of electric current flowing around the circuit. 
D)  amount of electric current consumed by the circuit elements. 
E)  amount of thermal energy produced in the circuit. 
A)  voltage around the circuit. 
B)  amount of energy given to each coulomb of electrical charge. 
C)  amount of electric current flowing around the circuit. 
D)  amount of electric current consumed by the circuit elements. 
E)  amount of thermal energy produced in the circuit.

Question 7

A "short circuit" is best described as

Accepted Answer

A)  a low resistance placed across a high voltage. 
B)  an electrical circuit with a very high resistance. 
C)  a high voltage that is not connected to an electrical circuit. 
D)  a high resistance placed across a low voltage. 
E)  an electrical circuit with a very high voltage. 
A)  a low resistance placed across a high voltage. 
B)  an electrical circuit with a very high resistance. 
C)  a high voltage that is not connected to an electrical circuit. 
D)  a high resistance placed across a low voltage. 
E)  an electrical circuit with a very high voltage.

Question 8

An "ion" is

Accepted Answer

A)  an atom having a particular number of protons in the nucleus. 
B)  two or more atoms stuck together. 
C)  an atom with an excess or deficiency of electrons. 
D)  a device used to press clothes. 
E)  an atom in an excited state. 
A)  an atom having a particular number of protons in the nucleus. 
B)  two or more atoms stuck together. 
C)  an atom with an excess or deficiency of electrons. 
D)  a device used to press clothes. 
E)  an atom in an excited state.

Question 9

The force that is exerted by a magnet as it picks up iron nails could be best described as

Accepted Answer

A)  the force of attraction between the nuclei of atoms in the magnet and the nuclei of atoms in the nails. 
B)  the electric force exerted by electrons in the magnet, on electrons in the nails. 
C)  the magnetic force exerted by ions moving within the magnet on electrons moving within the nails. 
D)  the magnetic force exerted by electrons moving within the magnet, on electrons moving within the nails. 
E)  the electric force exerted by ions in the magnet on electrons in the nails. 
A)  the force of attraction between the nuclei of atoms in the magnet and the nuclei of atoms in the nails. 
B)  the electric force exerted by electrons in the magnet, on electrons in the nails. 
C)  the magnetic force exerted by ions moving within the magnet on electrons moving within the nails. 
D)  the magnetic force exerted by electrons moving within the magnet, on electrons moving within the nails. 
E)  the electric force exerted by ions in the magnet on electrons in the nails.

Question 10

What form of energy do electrons have when they're at rest on the negative terminal of an isolated (not connected to an electrical circuit) batters?

Accepted Answer

A)  radiant 
B)  electrical 
C)  thermal 
D)  chemical 
E)  Actually, they don't have any energy. 
A)  radiant 
B)  electrical 
C)  thermal 
D)  chemical 
E)  Actually, they don't have any energy.

Question 11

Regarding the charges of the electron, proton and neutron:

Accepted Answer

A)  the proton has a positive charge, the electron has a negative charge whose strength is equal to the strength of the proton's charge, and the neutron has no charge. 
B)  the electron has a negative charge, the proton has a positive charge, and the neutron has a charge that can be positive or negative or zero depending on the ionization of the atom in which it resides. 
C)  the proton has a positive charge, the electron has a much smaller negative charge, and the neutron has no charge. 
D)  the proton has a positive charge, the neutron has a negative charge whose strength is equal to that of the proton's charge, and the electron has no charge. 
E)  these objects are charged only when they reside in an ionized atom; otherwise, all three are uncharged. 
A)  the proton has a positive charge, the electron has a negative charge whose strength is equal to the strength of the proton's charge, and the neutron has no charge. 
B)  the electron has a negative charge, the proton has a positive charge, and the neutron has a charge that can be positive or negative or zero depending on the ionization of the atom in which it resides. 
C)  the proton has a positive charge, the electron has a much smaller negative charge, and the neutron has no charge. 
D)  the proton has a positive charge, the neutron has a negative charge whose strength is equal to that of the proton's charge, and the electron has no charge. 
E)  these objects are charged only when they reside in an ionized atom; otherwise, all three are uncharged.

Question 12

If two electrons are at rest a short distance apart, they will feel

Accepted Answer

A)  both electric and magnetic forces. 
B)  a repulsive electric force, but no magnetic force. 
C)  an attractive electric force, but no magnetic force. 
D)  no electromagnetic forces. 
E)  a magnetic force but no electric force. 
A)  both electric and magnetic forces. 
B)  a repulsive electric force, but no magnetic force. 
C)  an attractive electric force, but no magnetic force. 
D)  no electromagnetic forces. 
E)  a magnetic force but no electric force.

Question 13

A changing magnetic field creates an electric field. This is one way of stating

Accepted Answer

A)  the magnetic force law. 
B)  the principle of conservation of electromagnetic fields. 
C)  the law of force pairs. 
D)  Faraday's law. 
E)  the electric force law. 
A)  the magnetic force law. 
B)  the principle of conservation of electromagnetic fields. 
C)  the law of force pairs. 
D)  Faraday's law. 
E)  the electric force law.

Question 14

Suppose you released a single proton from rest at some point X in an electric field, and that you then released a single electron from rest at the same point X. How would the motions of the proton and electron compare, just after their release from rest?

Accepted Answer

A)  They would move in opposite directions, and the electron would move fastest. 
B)  They would move in opposite directions, and the proton would move fastest. 
C)  They would move in the same directions, and the electron would move fastest. 
D)  They would move in opposite directions, and at the same speeds. 
E)  They would move in the same directions, and the proton would move fastest. 
A)  They would move in opposite directions, and the electron would move fastest. 
B)  They would move in opposite directions, and the proton would move fastest. 
C)  They would move in the same directions, and the electron would move fastest. 
D)  They would move in opposite directions, and at the same speeds. 
E)  They would move in the same directions, and the proton would move fastest.

Question 15

J. J. Thomson's experiments with a type of invisible beam known as a cathode ray demonstrated that

Accepted Answer

A)  neutrons exist. 
B)  light is a wave. 
C)  electrons exist. 
D)  light is made of particles. 
E)  the atom contains a tiny nucleus containing most of the atom's mass. 
A)  neutrons exist. 
B)  light is a wave. 
C)  electrons exist. 
D)  light is made of particles. 
E)  the atom contains a tiny nucleus containing most of the atom's mass.

Question 16

Two small electrically charged objects are placed 12 centimeters (cm) apart, where they exert a force of 2 N on each other. How far apart must they be placed in order to exert at force of 8 N on each other?

Accepted Answer

A)  24 cm 
B)  48 cm 
C)  9 cm 
D)  6 cm 
E)  3 cm 
A)  24 cm 
B)  48 cm 
C)  9 cm 
D)  6 cm 
E)  3 cm

Question 17

A proton is maintained at rest in the middle of a box that has no matter inside it other than the single proton. Assuming that the box is isolated from all external influences, which of the following would we expect to find at some other point X inside the box?

Accepted Answer

A)  a magnetic field 
B)  an electric field 
C)  Both of the above. 
D)  an electric force 
E)  All of the above. 
A)  a magnetic field 
B)  an electric field 
C)  Both of the above. 
D)  an electric force 
E)  All of the above.

Question 18

An atom gains one extra electron. How does the resulting ion behave when it is near a positively charged transparency? How does the ion behave when it is near a negatively charged tissue?

Accepted Answer

A)  The ion is repelled from both the transparency and from the tissue. 
B)  The ion is attracted to the positively charged transparency, but repelled from the negatively charged tissue. 
C)  The ion is repelled from the positively charged transparency, but attracted to the negatively charged tissue. 
D)  The ion is attracted to both the transparency and to the tissue. 
A)  The ion is repelled from both the transparency and from the tissue. 
B)  The ion is attracted to the positively charged transparency, but repelled from the negatively charged tissue. 
C)  The ion is repelled from the positively charged transparency, but attracted to the negatively charged tissue. 
D)  The ion is attracted to both the transparency and to the tissue.

Question 19

Regarding the masses of the electron, proton, and neutron:

Accepted Answer

A)  the proton and neutron have roughly the same mass, and both are far more massive than the electron. 
B)  the proton and electron have roughly the same mass, and both are far more massive than the neutron. 
C)  the proton and neutron have roughly the same mass, and both are about twice as massive as the electron. 
D)  the proton is much more massive, while the electron and neutron have roughly the same mass. 
E)  the proton is the most massive, the electron is far less massive, and the neutron has a mass about midway between the proton and electron mass. 
A)  the proton and neutron have roughly the same mass, and both are far more massive than the electron. 
B)  the proton and electron have roughly the same mass, and both are far more massive than the neutron. 
C)  the proton and neutron have roughly the same mass, and both are about twice as massive as the electron. 
D)  the proton is much more massive, while the electron and neutron have roughly the same mass. 
E)  the proton is the most massive, the electron is far less massive, and the neutron has a mass about midway between the proton and electron mass.

Question 20

Two small electrically charged objects are placed 6 centimeters (cm) apart, where they exert a force of 8 N on each other. How far apart must they be placed in order to exert a force of 2 N on each other?

Accepted Answer

A)  18 cm 
B)  9 cm 
C)  24 cm 
D)  12 cm 
E)  3 cm 
A)  18 cm 
B)  9 cm 
C)  24 cm 
D)  12 cm 
E)  3 cm

Suppose that the electric force between two objects is 2 N and that you then double the distance between the objects. The new force is

Earth's magnetism arises from

All magnetic forces are produced by

A neutral atom loses one of its electrons. It is then

A blow dryer with a resistance of 6 ohms is plugged into a 60- volt battery. How much current does it draw?

In an electrical circuit, the number of "amperes" measures the

A "short circuit" is best described as

An "ion" is

The force that is exerted by a magnet as it picks up iron nails could be best described as

What form of energy do electrons have when they're at rest on the negative terminal of an isolated (not connected to an electrical circuit) batters?

Regarding the charges of the electron, proton and neutron:

If two electrons are at rest a short distance apart, they will feel

A changing magnetic field creates an electric field. This is one way of stating

Suppose you released a single proton from rest at some point X in an electric field, and that you then released a single electron from rest at the same point X. How would the motions of the proton and electron compare, just after their release from rest?

J. J. Thomson's experiments with a type of invisible beam known as a cathode ray demonstrated that

Two small electrically charged objects are placed 12 centimeters (cm) apart, where they exert a force of 2 N on each other. How far apart must they be placed in order to exert at force of 8 N on each other?

A proton is maintained at rest in the middle of a box that has no matter inside it other than the single proton. Assuming that the box is isolated from all external influences, which of the following would we expect to find at some other point X inside the box?

An atom gains one extra electron. How does the resulting ion behave when it is near a positively charged transparency? How does the ion behave when it is near a negatively charged tissue?

Regarding the masses of the electron, proton, and neutron:

Two small electrically charged objects are placed 6 centimeters (cm) apart, where they exert a force of 8 N on each other. How far apart must they be placed in order to exert a force of 2 N on each other?

The Way of Science: Experience and Reason

Atoms: the Nature of Things

How Things Move: Galileo Asks the Right Questions

Why Things Move As They Do

Newtons Universe

Conservation of Energy: You Cant Get Ahead

Second Law of Thermodynamics: and You Cant Even Break Even

Electromagnetism Radiation and Global Climate Change

The Special Theory of Relativity

The General Theory of Relativity and the New Cosmology

The Quantum Idea

The Quantum Universe

The Nucleus and Radioactivity: an New Force

Fusion and Fission: and a New Energy

The Energy Challenge

Quantum Fields: Relativity Meets the Quantum

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Exam 8: Light and Electromagnetism

Suppose that the electric force between two objects is 2 N and that you then double the distance between the objects. The new force is

Earth's magnetism arises from

All magnetic forces are produced by

A neutral atom loses one of its electrons. It is then

A blow dryer with a resistance of 6 ohms is plugged into a 60- volt battery. How much current does it draw?

In an electrical circuit, the number of "amperes" measures the

A "short circuit" is best described as

An "ion" is

The force that is exerted by a magnet as it picks up iron nails could be best described as

What form of energy do electrons have when they're at rest on the negative terminal of an isolated (not connected to an electrical circuit) batters?

Regarding the charges of the electron, proton and neutron:

If two electrons are at rest a short distance apart, they will feel

A changing magnetic field creates an electric field. This is one way of stating

Suppose you released a single proton from rest at some point X in an electric field, and that you then released a single electron from rest at the same point X. How would the motions of the proton and electron compare, just after their release from rest?

J. J. Thomson's experiments with a type of invisible beam known as a cathode ray demonstrated that

Two small electrically charged objects are placed 12 centimeters (cm) apart, where they exert a force of 2 N on each other. How far apart must they be placed in order to exert at force of 8 N on each other?

A proton is maintained at rest in the middle of a box that has no matter inside it other than the single proton. Assuming that the box is isolated from all external influences, which of the following would we expect to find at some other point X inside the box?

An atom gains one extra electron. How does the resulting ion behave when it is near a positively charged transparency? How does the ion behave when it is near a negatively charged tissue?

Regarding the masses of the electron, proton, and neutron:

Two small electrically charged objects are placed 6 centimeters (cm) apart, where they exert a force of 8 N on each other. How far apart must they be placed in order to exert a force of 2 N on each other?

The Way of Science: Experience and Reason

Atoms: the Nature of Things

How Things Move: Galileo Asks the Right Questions

Why Things Move As They Do

Newtons Universe

Conservation of Energy: You Cant Get Ahead

Second Law of Thermodynamics: and You Cant Even Break Even

Electromagnetism Radiation and Global Climate Change

The Special Theory of Relativity

The General Theory of Relativity and the New Cosmology

The Quantum Idea

The Quantum Universe

The Nucleus and Radioactivity: an New Force

Fusion and Fission: and a New Energy

The Energy Challenge

Quantum Fields: Relativity Meets the Quantum

Filters