Question 1

The magnitude of the charge on an electron is approximately:

Accepted Answer

A)  1023 C 
B)  10-23 C 
C)  1019 C 
D)  10-19 C 
E)  109 C 
A)  1023 C 
B)  10-23 C 
C)  1019 C 
D)  10-19 C 
E)  109 C D

Question 2

One type of medical imaging process is called positron emission tomography. Radioactive material is injected into a patient; during the radioactive decay the material emits a positron, which then interacts with an atomic electron, emitting gamma rays, which are detected by the imager. This gamma ray emission process is called:

Accepted Answer

A)  pair production 
B)  annihilation 
C)  absorption 
D)  alpha decay 
E)  fission 
A)  pair production 
B)  annihilation 
C)  absorption 
D)  alpha decay 
E)  fission B

Question 3

A nucleus of carbon 14 has 6 protons and 8 neutrons. The atomic number and mass number of carbon 14 are, respectively,

Accepted Answer

A)  6 and 8 
B)  6 and 14 
C)  8 and 14 
D)  14 and 20 
E)  14 and 22 
A)  6 and 8 
B)  6 and 14 
C)  8 and 14 
D)  14 and 20 
E)  14 and 22 B

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$\mu$C 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 neutral metal ball is suspended by a string. A positively charged insulating rod is placed near the ball, which is observed to be attracted to the rod. This is because:

Accepted Answer

A)  the ball becomes positively charged by induction 
B)  the ball becomes negatively charged by induction 
C)  the number of electrons in the ball is more than the number in the rod 
D)  the string is not a perfect insulator 
E)  there is a rearrangement of the electrons in the ball 
A)  the ball becomes positively charged by induction 
B)  the ball becomes negatively charged by induction 
C)  the number of electrons in the ball is more than the number in the rod 
D)  the string is not a perfect insulator 
E)  there is a rearrangement of the electrons in the ball

Question 7

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 8

Is it ever possible for the following process to occur? γ → e+ + e- + e+

Accepted Answer

A)  Yes, it is. 
B)  No, this process does not conserve energy. 
C)  No, this process does not conserve momentum. 
D)  No, this process does not conserve mass. 
E)  No, this process does not conserve electric charge. 
A)  Yes, it is. 
B)  No, this process does not conserve energy. 
C)  No, this process does not conserve momentum. 
D)  No, this process does not conserve mass. 
E)  No, this process does not conserve electric charge.

Question 9

The units of 1/4$\pi$$\varepsilon$0 are:

Accepted Answer

A)  N2/C2 
B)  N.m/C 
C)  N2.m2/C2  
D)  N.m2/C2 
E)  m2/C2 
A)  N2/C2 
B)  N.m/C 
C)  N2.m2/C2  
D)  N.m2/C2 
E)  m2/C2

Question 10

Particle 1 with charge q1, and particle 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 11

Two small charged objects repel each other with a force F when separated by a distance d. If the charge on each object is reduced to one-fourth of its original value and the distance between them is reduced to d/2 the force becomes:

Accepted Answer

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

Question 12

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 13

A kiloampere .hour is a unit of:

Accepted Answer

A)  current 
B)  charge per time 
C)  power 
D)  charge 
E)  energy 
A)  current 
B)  charge per time 
C)  power 
D)  charge 
E)  energy

Question 14

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

Question 15

If excess charge is put on a spherical conductor,

Accepted Answer

A)  it remains where it was placed 
B)  it spreads a little from where it was placed but not over the whole sphere 
C)  it spreads uniformly over the surface of the sphere if the sphere is small 
D)  it spreads uniformly throughout the volume of the conductor 
E)  it spreads uniformly over the surface of the sphere 
A)  it remains where it was placed 
B)  it spreads a little from where it was placed but not over the whole sphere 
C)  it spreads uniformly over the surface of the sphere if the sphere is small 
D)  it spreads uniformly throughout the volume of the conductor 
E)  it spreads uniformly over the surface of the sphere

Question 16

Two uncharged metal spheres, L and M, are in contact. A negatively charged rod is brought close to L, but not touching it, as shown. The two spheres are slightly separated and the rod is then withdrawn. As a result:

Accepted Answer

A)  both spheres are neutral 
B)  both spheres are positive 
C)  both spheres are negative 
D)  L is negative and M is positive 
E)  L is positive and M is negative 
A)  both spheres are neutral 
B)  both spheres are positive 
C)  both spheres are negative 
D)  L is negative and M is positive 
E)  L is positive and M is negative

Question 17

An electrical insulator is a material:

Accepted Answer

A)  containing no electrons 
B)  through which electrons do not flow easily 
C)  which has more electrons than protons on its surface 
D)  cannot be a pure chemical element 
E)  must be a crystal 
A)  containing no electrons 
B)  through which electrons do not flow easily 
C)  which has more electrons than protons on its surface 
D)  cannot be a pure chemical element 
E)  must be a crystal

Question 18

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

Question 19

A coulomb is the same as:

Accepted Answer

A)  an ampere/second 
B)  half an ampere .second2 
C)  an ampere/meter2 
D)  an ampere .second 
E)  a newton .meter2 
A)  an ampere/second 
B)  half an ampere .second2 
C)  an ampere/meter2 
D)  an ampere .second 
E)  a newton .meter2

Question 20

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

Accepted Answer

A)  48 C 
B)  2.4 * 107 C 
C)  4.8 * 107 C 
D)  9.6 * 107 C 
E)  1.9 *108 C 
A)  48 C 
B)  2.4 * 107 C 
C)  4.8 * 107 C 
D)  9.6 * 107 C 
E)  1.9 *108 C

Exam 21: Electric Charge

The magnitude of the charge on an electron is approximately:

A nucleus of carbon 14 has 6 protons and 8 neutrons. The atomic number and mass number of carbon 14 are, respectively,

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 neutral metal ball is suspended by a string. A positively charged insulating rod is placed near the ball, which is observed to be attracted to the rod. This is because:

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

Is it ever possible for the following process to occur? γ → e+ + e- + e+

The units of 1/4 π\piπε\varepsilonε 0 are:

Particle 1 with charge q1, and particle 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=:

Two small charged objects repel each other with a force F when separated by a distance d. If the charge on each object is reduced to one-fourth of its original value and the distance between them is reduced to d/2 the force becomes:

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

A kiloampere .hour is a unit of:

To make an uncharged object have a positive charge:

If excess charge is put on a spherical conductor,

Two uncharged metal spheres, L and M, are in contact. A negatively charged rod is brought close to L, but not touching it, as shown. The two spheres are slightly separated and the rod is then withdrawn. As a result:

An electrical insulator is a material:

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

A coulomb is the same as:

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

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

Is it ever possible for the following process to occur? γ → e⁺+ e^- + e⁺

The units of 1/4 $\pi$ $\varepsilon$ ₀ are:

Particle 1 with charge q₁, and particle 2, with a charge q_2,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=: