Question 1

Of the following places one would expect that the horizontal component of the Earth's magnetic field to be largest in:

Accepted Answer

A)  Maine 
B)  Florida 
C)  Maryland 
D)  New York 
E)  Iowa 
A)  Maine 
B)  Florida 
C)  Maryland 
D)  New York 
E)  Iowa

Question 2

Displacement current is:

Accepted Answer

A)  d$\phi$E/dt 
B)  $\varepsilon$0d$\phi$ E/dt 
C)  $\mu$0d$\phi$ E/dt 
D)  $\mu$0$\varepsilon$0d$\phi$ E/dt 
E)  -d$\phi$ B/dt 
A)  d$\phi$E/dt 
B)  $\varepsilon$0d$\phi$ E/dt 
C)  $\mu$0d$\phi$ E/dt 
D)  $\mu$0$\varepsilon$0d$\phi$ E/dt 
E)  -d$\phi$ B/dt

Question 3

A 1.2-m radius cylindrical region contains a uniform electric field along the cylinder axis. It is increasing uniformly with time. To obtain a total displacement current of 2.0*10 - 9 A through a cross section of the region, the magnitude of the electric field should change at a rate of:

Accepted Answer

A)  5.0 V/m·s 
B)  12 V/m·s 
C)  37 V/m·s 
D)  50 V/m·s 
E)  4.0 *107 V/m·s 
A)  5.0 V/m·s 
B)  12 V/m·s 
C)  37 V/m·s 
D)  50 V/m·s 
E)  4.0 *107 V/m·s

Question 4

Which of the following statements is correct?

Accepted Answer

A)  The spin angular momentum of the electron can be directly observed, but the spin magnetic dipole moment cannot be. 
B)  The spin angular momentum of the electron cannot be directly observed, but the spin magnetic dipole moment can be. 
C)  Both the spin angular momentum and the spin magnetic dipole moment of the electron can be directly observed. 
D)  Neither the spin angular momentum nor the spin magnetic dipole moment of the electron can be directly observed. 
E)  Although both the spin angular momentum and the spin magnetic dipole moment can be defined theoretically, neither has any physical meaning at all. 
A)  The spin angular momentum of the electron can be directly observed, but the spin magnetic dipole moment cannot be. 
B)  The spin angular momentum of the electron cannot be directly observed, but the spin magnetic dipole moment can be. 
C)  Both the spin angular momentum and the spin magnetic dipole moment of the electron can be directly observed. 
D)  Neither the spin angular momentum nor the spin magnetic dipole moment of the electron can be directly observed. 
E)  Although both the spin angular momentum and the spin magnetic dipole moment can be defined theoretically, neither has any physical meaning at all.

Question 5

A sinusoidal emf is connected to a parallel plate capacitor. The magnetic field between the plates is:

Accepted Answer

A)  zero 
B)  constant 
C)  sinusoidal and its amplitude does not depend on the frequency of the source 
D)  sinusoidal and its amplitude is proportional to the frequency of the source 
E)  sinusoidal and its amplitude is inversely proportional to the frequency of the source 
A)  zero 
B)  constant 
C)  sinusoidal and its amplitude does not depend on the frequency of the source 
D)  sinusoidal and its amplitude is proportional to the frequency of the source 
E)  sinusoidal and its amplitude is inversely proportional to the frequency of the source

Question 6

One of the crucial facts upon which the Maxwell equations are based is:

Accepted Answer

A)  the numerical value of the electron charge 
B)  charge is quantized 
C)  the numerical value of the charge/mass ratio of the electron 
D)  there are three types of magnetic materials 
E)  none of the above 
A)  the numerical value of the electron charge 
B)  charge is quantized 
C)  the numerical value of the charge/mass ratio of the electron 
D)  there are three types of magnetic materials 
E)  none of the above

Question 7

An electron traveling with speed v around a circle of radius r is equivalent to a current of:

Accepted Answer

A)  evr/2 
B)  ev/r 
C)  ev/2 $\pi$r 
D)  2 $\pi$er/v 
E)  2 $\pi$ev/r 
A)  evr/2 
B)  ev/r 
C)  ev/2 $\pi$r 
D)  2 $\pi$er/v 
E)  2 $\pi$ev/r

Question 8

A circular parallel-plate capacitor whose plates have a radius of 25 cm is being charged with a current of 1.3 A. What is the magnetic field 11 cm from the center of the plates?

Accepted Answer

A)  4.6 x 10-7 T 
B)  1.0 x 10-6 T 
C)  2.4 x 10-6 T 
D)  3.1 x 10-6 T 
E)  6.2 x 10-6 T 
A)  4.6 x 10-7 T 
B)  1.0 x 10-6 T 
C)  2.4 x 10-6 T 
D)  3.1 x 10-6 T 
E)  6.2 x 10-6 T

Question 9

An unmagnetized steel bar is placed inside a solenoid. As the current in the solenoid is slowly increased from zero to some large value, the magnetization of the bar:

Accepted Answer

A)  increases proportionally with the current 
B)  remains zero for a while and then increases linearly with any further increase in current 
C)  increases with increasing current at first but later is much less affected by it 
D)  is unaffected by the current 
E)  increases quadratically with the current 
A)  increases proportionally with the current 
B)  remains zero for a while and then increases linearly with any further increase in current 
C)  increases with increasing current at first but later is much less affected by it 
D)  is unaffected by the current 
E)  increases quadratically with the current

Question 10

A positively charged ion, due to a cosmic ray, is headed through Earth's atmosphere toward the center of Earth. Due to Earth's magnetic field, the ion will be deflected:

Accepted Answer

A)  south 
B)  north 
C)  west 
D)  east 
E)  not at all since it is a charge and not a pole 
A)  south 
B)  north 
C)  west 
D)  east 
E)  not at all since it is a charge and not a pole

Question 11

A bar magnet is broken in half. Each half is broken in half again, etc. The observation is that each piece has both a north and south pole. This is usually explained by:

Accepted Answer

A)  Ampere's theory that all magnetic phenomena result from electric currents 
B)  our inability to divide the magnet into small enough pieces 
C)  Coulomb's law 
D)  Lenz' law 
E)  conservation of charge 
A)  Ampere's theory that all magnetic phenomena result from electric currents 
B)  our inability to divide the magnet into small enough pieces 
C)  Coulomb's law 
D)  Lenz' law 
E)  conservation of charge

Question 12

Magnetization vectors in neighboring ferromagnetic domains are:

Accepted Answer

A)  always in opposite directions 
B)  always in the same direction 
C)  always in different directions 
D)  sometimes in different directions and sometimes in the same direction 
E)  sometimes in opposite directions and sometimes in the same direction 
A)  always in opposite directions 
B)  always in the same direction 
C)  always in different directions 
D)  sometimes in different directions and sometimes in the same direction 
E)  sometimes in opposite directions and sometimes in the same direction

Question 13

Two of Maxwell's equations contain an integral over a closed surface. For them the infinitesimal vector area is always:

Accepted Answer

A)  tangent to the surface 
B)  perpendicular to the surface and pointing outward 
C)  perpendicular to the surface and pointing inward 
D)  tangent to a field line 
E)  perpendicular to a field line 
A)  tangent to the surface 
B)  perpendicular to the surface and pointing outward 
C)  perpendicular to the surface and pointing inward 
D)  tangent to a field line 
E)  perpendicular to a field line

Question 14

The units of magnetization are:

Accepted Answer

A)  ampere 
B)  ampere.meter 
C)  ampere.meter2 
D)  ampere/meter 
E)  ampere/meter2 
A)  ampere 
B)  ampere.meter 
C)  ampere.meter2 
D)  ampere/meter 
E)  ampere/meter2

Question 15

Four closed surfaces are shown, each with circular top and bottom faces and curved sides. The areas Atop and Abot of the top and bottom faces and the magnitudes Btop and Bbot of the uniform magnetic fields through the top and bottom faces are given. The fields are perpendicular to the faces and are either inward or outward. Rank the surfaces according to the magnitude of the magnetic flux through the curved sides, least to greatest.

Accepted Answer

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

Question 16

The magnetic field of Earth is roughly the same as that of a magnetic dipole with a dipole moment of about:

Accepted Answer

A)  1017 J/T 
B)  1019 J/T 
C)  1021 J/T 
D)  1023 J/T 
E)  1025 J/T 
A)  1017 J/T 
B)  1019 J/T 
C)  1021 J/T 
D)  1023 J/T 
E)  1025 J/T

Question 17

Displacement current exists wherever there is:

Accepted Answer

A)  moving charge 
B)  a magnetic field 
C)  a changing magnetic field 
D)  an electric field 
E)  a changing electric field 
A)  moving charge 
B)  a magnetic field 
C)  a changing magnetic field 
D)  an electric field 
E)  a changing electric field

Question 18

A 0.70-m radius cylindrical region contains a uniform electric field that is parallel to the axis and is increasing at the rate 5.0 * 1012 V/m.s. The magnetic field at a point 1.2 m from the axis has a magnitude of:

Accepted Answer

A)  0 T 
B)  7.0 *10-6 T 
C)  1.1* 10-5 T 
D)  2.3 * 10-5 T 
E)  2.8 *10-5 T 
A)  0 T 
B)  7.0 *10-6 T 
C)  1.1* 10-5 T 
D)  2.3 * 10-5 T 
E)  2.8 *10-5 T

Question 19

A magnetic field is applied to a diamagnetic substance. In the interior the magnetic field produced by the magnetic dipoles of the substance is:

Accepted Answer

A)  greater than and in the opposite direction 
B)  less than and in the opposite direction 
C)  greater than and in the same direction 
D)  less than and in the same direction 
E)  the same as 
A)  greater than and in the opposite direction 
B)  less than and in the opposite direction 
C)  greater than and in the same direction 
D)  less than and in the same direction 
E)  the same as

Question 20

A magnetic field is applied to a paramagnetic substance. In the interior the magnetic field produced by the magnetic dipoles of the substance is:

Accepted Answer

A)  greater than and in the opposite direction 
B)  less than and in the opposite direction 
C)  greater than and in the same direction 
D)  less than and in the same direction 
E)  the same as 
A)  greater than and in the opposite direction 
B)  less than and in the opposite direction 
C)  greater than and in the same direction 
D)  less than and in the same direction 
E)  the same as

Exam 32: Maxwells Equations; Magnetism of Matter

Of the following places one would expect that the horizontal component of the Earth's magnetic field to be largest in:

Displacement current is:

A 1.2-m radius cylindrical region contains a uniform electric field along the cylinder axis. It is increasing uniformly with time. To obtain a total displacement current of 2.0*10 - 9 A through a cross section of the region, the magnitude of the electric field should change at a rate of:

Which of the following statements is correct?

A sinusoidal emf is connected to a parallel plate capacitor. The magnetic field between the plates is:

One of the crucial facts upon which the Maxwell equations are based is:

An electron traveling with speed v around a circle of radius r is equivalent to a current of:

A circular parallel-plate capacitor whose plates have a radius of 25 cm is being charged with a current of 1.3 A. What is the magnetic field 11 cm from the center of the plates?

An unmagnetized steel bar is placed inside a solenoid. As the current in the solenoid is slowly increased from zero to some large value, the magnetization of the bar:

A positively charged ion, due to a cosmic ray, is headed through Earth's atmosphere toward the center of Earth. Due to Earth's magnetic field, the ion will be deflected:

A bar magnet is broken in half. Each half is broken in half again, etc. The observation is that each piece has both a north and south pole. This is usually explained by:

Magnetization vectors in neighboring ferromagnetic domains are:

Two of Maxwell's equations contain an integral over a closed surface. For them the infinitesimal vector area is always:

The units of magnetization are:

The magnetic field of Earth is roughly the same as that of a magnetic dipole with a dipole moment of about:

Displacement current exists wherever there is:

A 0.70-m radius cylindrical region contains a uniform electric field that is parallel to the axis and is increasing at the rate 5.0 * 1012 V/m.s. The magnetic field at a point 1.2 m from the axis has a magnitude of:

A magnetic field is applied to a diamagnetic substance. In the interior the magnetic field produced by the magnetic dipoles of the substance is:

A magnetic field is applied to a paramagnetic substance. In the interior the magnetic field produced by the magnetic dipoles of the substance 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 Charge

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

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

A 1.2-m radius cylindrical region contains a uniform electric field along the cylinder axis. It is increasing uniformly with time. To obtain a total displacement current of 2.0*10 ^- ⁹A through a cross section of the region, the magnitude of the electric field should change at a rate of:

A 0.70-m radius cylindrical region contains a uniform electric field that is parallel to the axis and is increasing at the rate 5.0 * 10¹² V/m.s. The magnetic field at a point 1.2 m from the axis has a magnitude of: