Question 1

Consider the following procedural steps:   To charge an electroscope by induction, use the sequence:

Accepted Answer

A)  1, 4, 5, 2 
B)  4, 1, 2, 5 
C)  3, 1, 2, 5 
D)  4, 1, 5, 2 
E)  3, 5 
A)  1, 4, 5, 2 
B)  4, 1, 2, 5 
C)  3, 1, 2, 5 
D)  4, 1, 5, 2 
E)  3, 5 B

Question 2

Charge is distributed uniformly on the surface of a spherical balloon (an insulator). A point particle with charge q is inside. The electrical force on the particle q is greatest when:

Accepted Answer

A)  it is near the inside surface of the balloon 
B)  it is at the center of the balloon 
C)  it is halfway between the balloon center and the inside surface 
D)  it is anywhere inside (the force is same everywhere and is not zero) 
E)  it is anywhere inside (the force is zero everywhere) 
A)  it is near the inside surface of the balloon 
B)  it is at the center of the balloon 
C)  it is halfway between the balloon center and the inside surface 
D)  it is anywhere inside (the force is same everywhere and is not zero) 
E)  it is anywhere inside (the force is zero everywhere) E

Question 3

When a hard rubber rod is given a negative charge by rubbing it with wool:

Accepted Answer

A)  positive charges are transferred from rod to wool 
B)  negative charges are transferred from rod to wool 
C)  positive charges are transferred from wool to rod 
D)  negative charges are transferred from wool to rod 
E)  negative charges are created and stored on the rod 
A)  positive charges are transferred from rod to wool 
B)  negative charges are transferred from rod to wool 
C)  positive charges are transferred from wool to rod 
D)  negative charges are transferred from wool to rod 
E)  negative charges are created and stored on the rod D

Question 4

A positively charged insulating rod is brought close to an object that is suspended by a string. If the object is repelled away from the rod we can conclude:

Accepted Answer

A)  the object is positively charged 
B)  the object is negatively charged 
C)  the object is an insulator 
D)  the object is a conductor 
E)  none of the above 
A)  the object is positively charged 
B)  the object is negatively charged 
C)  the object is an insulator 
D)  the object is a conductor 
E)  none of the above

Question 5

A particle with charge 2 $\degree$C charge is placed at the origin, an identical particle, with the same charge, is placed 2 m from the origin on the x axis, and a third identical particle, with the same charge, is placed 2 m from the origin on the y axis. The magnitude of the force on the particle at the origin is:

Accepted Answer

A)  9.0 *10-3 N 
B)  6.4 *10-3 N 
C)  1.3 *10-2 N 
D)  1.8 *10-2 N 
E)  3.6 * 10-2 N 
A)  9.0 *10-3 N 
B)  6.4 *10-3 N 
C)  1.3 *10-2 N 
D)  1.8 *10-2 N 
E)  3.6 * 10-2 N

Question 6

A positively charged insulating rod is brought close to an object that is suspended by a string. If the object is attracted toward the rod we can conclude:

Accepted Answer

A)  the object is positively charged 
B)  the object is negatively charged 
C)  the object is an insulator 
D)  the object is a conductor 
E)  none of the above 
A)  the object is positively charged 
B)  the object is negatively charged 
C)  the object is an insulator 
D)  the object is a conductor 
E)  none of the above

Question 7

Particles 1, with charge q1 and 2, with a charge q2 are on the x axis, with particle 1 at x = a with and particle 2 at x = -2a. For the net force on a third charged particle, at the origin to be zero q1 and q2 must be related by q2=:

Accepted Answer

A)  2q1 
B)  4q1 
C)  -2q1 
D)  -4q1 
E)  -q1/4 
A)  2q1 
B)  4q1 
C)  -2q1 
D)  -4q1 
E)  -q1/4

Question 8

A positively charged metal sphere A is brought into contact with an uncharged metal sphere B. As a result:

Accepted Answer

A)  both spheres are positively charged 
B)  A is positively charged and B is neutral 
C)  A is positively charged and B is negatively charged 
D)  A is neutral and B is positively charged 
E)  A is neutral and B is negatively charged 
A)  both spheres are positively charged 
B)  A is positively charged and B is neutral 
C)  A is positively charged and B is negatively charged 
D)  A is neutral and B is positively charged 
E)  A is neutral and B is negatively charged

Question 9

An electroscope is charged by induction using a glass rod that has been made positive by rubbing it with silk. The electroscope leaves:

Accepted Answer

A)  gain electrons 
B)  gain protons 
C)  lose electrons 
D)  lose protons 
E)  gain an equal number of protons and electrons 
A)  gain electrons 
B)  gain protons 
C)  lose electrons 
D)  lose protons 
E)  gain an equal number of protons and electrons

Question 10

A 5.0-C charge is 10 m from a -2.0-C charge. The electrostatic force is on the positive charge is:

Accepted Answer

A)  9.0 * 108 N toward the negative charge 
B)  9.0 *108 N away from the negative charge 
C)  9.0 * 109 N toward the negative charge 
D)  9.0 *109 N away from the negative charge 
E)  none of these 
A)  9.0 * 108 N toward the negative charge 
B)  9.0 *108 N away from the negative charge 
C)  9.0 * 109 N toward the negative charge 
D)  9.0 *109 N away from the negative charge 
E)  none of these

Question 11

Two identical conducting spheres A and B carry equal charge. They are separated by a distance much larger than their diameters. A third identical conducting sphere C is uncharged. Sphere C is first touched to A, then to B, and finally removed. As a result, the electrostatic force between A and B, which was originally F, becomes:

Accepted Answer

A)  F/2 
B)  F/4 
C)  3F/8 
D)  F/16 
E)  0 
A)  F/2 
B)  F/4 
C)  3F/8 
D)  F/16 
E)  0

Question 12

To make an uncharged object have a negative charge we must:

Accepted Answer

A)  add some atoms 
B)  remove some atoms 
C)  add some electrons 
D)  remove some electrons 
E)  write down a negative sign 
A)  add some atoms 
B)  remove some atoms 
C)  add some electrons 
D)  remove some electrons 
E)  write down a negative sign

Question 13

Two particles have charges Q and -Q (equal magnitude and opposite sign). For a net force of zero to be exerted on a third charge it must be placed:

Accepted Answer

A)  midway between Q and -Q 
B)  on the perpendicular bisector of the line joining Q and -Q, but not on that line itself 
C)  on the line joining Q and -Q, to the side of Q opposite -Q 
D)  on the line joining Q and -Q, to the side of -Q opposite Q 
E)  at none of these places (there is no place) 
A)  midway between Q and -Q 
B)  on the perpendicular bisector of the line joining Q and -Q, but not on that line itself 
C)  on the line joining Q and -Q, to the side of Q opposite -Q 
D)  on the line joining Q and -Q, to the side of -Q opposite Q 
E)  at none of these places (there is no place)

Question 14

A wire contains a steady current of 2 A. The number of electrons that pass a cross section in 2 s is:

Accepted Answer

A)  2 
B)  4 
C)  6.3*1018 
D)  1.3 *1019 
E)  2.5 * 1019 
A)  2 
B)  4 
C)  6.3*1018 
D)  1.3 *1019 
E)  2.5 * 1019

Question 15

The magnitude of the total negative charge on the electrons in 1 mol of helium (atomic number 2, atomic mass 4) is:

Accepted Answer

A)  4.8 * 104 C 
B)  9.6 *104 C 
C)  1.9*105 C 
D)  3.8 *105 C 
E)  7.7 * 105 C 
A)  4.8 * 104 C 
B)  9.6 *104 C 
C)  1.9*105 C 
D)  3.8 *105 C 
E)  7.7 * 105 C

Question 16

A negatively charged rubber rod is brought near the knob of a positively charged electroscope. The result is that:

Accepted Answer

A)  electroscope leaves will move farther apart 
B)  the rod will lose its charge 
C)  electroscope leaves will tend to collapse 
D)  electroscope will become discharged 
E)  nothing noticeable will happen 
A)  electroscope leaves will move farther apart 
B)  the rod will lose its charge 
C)  electroscope leaves will tend to collapse 
D)  electroscope will become discharged 
E)  nothing noticeable will happen

Question 17

A charge Q is spread uniformly along the circumference of a circle of radius R. A point particlewith charge q is placed at the center of this circle. The total force exerted on the particle q can be calculated by Coulomb's law:

Accepted Answer

A)  just use R for the distance 
B)  just use 2R for the distance 
C)  just use 2 $\pi$R for the distance 
D)  result of the calculation is zero 
E)  none of the above 
A)  just use R for the distance 
B)  just use 2R for the distance 
C)  just use 2 $\pi$R for the distance 
D)  result of the calculation is zero 
E)  none of the above

Question 18

A wire contains a steady current of 2 A. The charge that passes a cross section in 2 s is:

Accepted Answer

A)  3.2 * 10-19 C 
B)  6.4 * 10-19 C 
C)  1 C 
D)  2 C 
E)  4 C 
A)  3.2 * 10-19 C 
B)  6.4 * 10-19 C 
C)  1 C 
D)  2 C 
E)  4 C

Question 19

Two protons (p1 and p2) and an electron (e) lie on a straight line, as shown. The directions of the force of p1 on e, the force of p2 on e, and the total force on e, respectively, are:

Accepted Answer

A)  $\rightarrow$, $\leftarrow$, $\rightarrow$ 
B)  $\leftarrow$, $\rightarrow$, $\rightarrow$ 
C)  $\rightarrow$, $\leftarrow$, $\leftarrow$ 
D)  $\leftarrow$, $\rightarrow$, $\leftarrow$ 
E)  $\leftarrow$, $\leftarrow$, $\leftarrow$ 
A)  $\rightarrow$, $\leftarrow$, $\rightarrow$ 
B)  $\leftarrow$, $\rightarrow$, $\rightarrow$ 
C)  $\rightarrow$, $\leftarrow$, $\leftarrow$ 
D)  $\leftarrow$, $\rightarrow$, $\leftarrow$ 
E)  $\leftarrow$, $\leftarrow$, $\leftarrow$

Question 20

To make an uncharged object have a positive charge:

Accepted Answer

A)  remove some neutrons 
B)  add some neutrons 
C)  add some electrons 
D)  remove some electrons 
E)  heat it to cause a change of phase 
A)  remove some neutrons 
B)  add some neutrons 
C)  add some electrons 
D)  remove some electrons 
E)  heat it to cause a change of phase

Exam 21: Electric Charge

Consider the following procedural steps: To charge an electroscope by induction, use the sequence:

Charge is distributed uniformly on the surface of a spherical balloon (an insulator). A point particle with charge q is inside. The electrical force on the particle q is greatest when:

When a hard rubber rod is given a negative charge by rubbing it with wool:

A positively charged insulating rod is brought close to an object that is suspended by a string. If the object is repelled away from the rod we can conclude:

A positively charged insulating rod is brought close to an object that is suspended by a string. If the object is attracted toward the rod we can conclude:

Particles 1, with charge q1 and 2, with a charge q2 are on the x axis, with particle 1 at x = a with and particle 2 at x = -2a. For the net force on a third charged particle, at the origin to be zero q1 and q2 must be related by q2=:

A positively charged metal sphere A is brought into contact with an uncharged metal sphere B. As a result:

An electroscope is charged by induction using a glass rod that has been made positive by rubbing it with silk. The electroscope leaves:

A 5.0-C charge is 10 m from a -2.0-C charge. The electrostatic force is on the positive charge is:

To make an uncharged object have a negative charge we must:

Two particles have charges Q and -Q (equal magnitude and opposite sign). For a net force of zero to be exerted on a third charge it must be placed:

A wire contains a steady current of 2 A. The number of electrons that pass a cross section in 2 s is:

The magnitude of the total negative charge on the electrons in 1 mol of helium (atomic number 2, atomic mass 4) is:

A negatively charged rubber rod is brought near the knob of a positively charged electroscope. The result is that:

A charge Q is spread uniformly along the circumference of a circle of radius R. A point particlewith charge q is placed at the center of this circle. The total force exerted on the particle q can be calculated by Coulomb's law:

A wire contains a steady current of 2 A. The charge that passes a cross section in 2 s is:

Two protons (p1 and p2) and an electron (e) lie on a straight line, as shown. The directions of the force of p1 on e, the force of p2 on e, and the total force on e, respectively, are:

To make an uncharged object have a positive charge:

Measurement

Motion Along a Straight Line

Vector

Motion in Two and Three Dimensions

Force and Motion I

Force and Motion II

Kinetic Energy and Work

Potential Energy and Conservation of Energy

Center of Mass and Linear Momentum

Rotation

Rolling, Torque, and Angular Momentum

Equilibrium and Elasticity

Gravitation

Fluids

Oscillations

Waves I

Waves II

Temperature, Heat, and the First Law of Thermodynamics

The Kinetic Theory of Gases

Entropy and the Second Law of Thermodynamics

Electric Fields

Gauss Law

Electric Potential

Capacitance

Current and Resistance

Circuits

Magnetic Fields

Magnetic Fields Due to Currents

Induction and Inductance

Electromagnetic Oscillations and Alternating Current

Maxwells Equations; Magnetism of Matter

Electromagnetic Waves

Images

Interference

Diffraction

Relativity

Photons and Matter Waves

More About Matter Waves

All About Atoms

Conduction of Electricity in Solids

Nuclear Physics

Energy From the Nucleus

Quarks, Leptons, and the Big Bang

Filters

Particles 1, with charge q₁ and 2, with a charge q₂are on the x axis, with particle 1 at x = a with and particle 2 at x = -2a. For the net force on a third charged particle, at the origin to be zero q₁ and q₂ must be related by q₂=:

Two protons (p₁ and p₂) and an electron (e) lie on a straight line, as shown. The directions of the force of p₁ on e, the force of p₂ on e, and the total force on e, respectively, are: