Question 1

The magnitude of the Bohr magneton in J/T is about:

Accepted Answer

A)  10-15 
B)  10-19 
C)  10-23 
D)  10-27 
E)  10-31 
A)  10-15 
B)  10-19 
C)  10-23 
D)  10-27 
E)  10-31

Question 2

Lenz' law can explain:

Accepted Answer

A)  paramagnetism only 
B)  diamagnetism only 
C)  ferromagnetism only 
D)  only two of the three types of magnetism 
E)  all three of the types of magnetism 
A)  paramagnetism only 
B)  diamagnetism only 
C)  ferromagnetism only 
D)  only two of the three types of magnetism 
E)  all three of the types of magnetism

Question 3

Consider the four Maxwell equations:   Which of these must be modified if magnetic poles are discovered?

Accepted Answer

A)  only I 
B)  only II 
C)  only II and III 
D)  only III and IV 
E)  only II, III, IV 
A)  only I 
B)  only II 
C)  only II and III 
D)  only III and IV 
E)  only II, III, IV

Question 4

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 5

The polarity of an unmarked magnet can be determined using:

Accepted Answer

A)  a charged glass rod 
B)  a compass 
C)  an electroscope 
D)  another unmarked magnet 
E)  iron filings 
A)  a charged glass rod 
B)  a compass 
C)  an electroscope 
D)  another unmarked magnet 
E)  iron filings

Question 6

Two of Maxwell's equations contain a path integral on the left side and an area integral on the right. For them:

Accepted Answer

A)  the path must pierce the area 
B)  the path must be well-separated from the area 
C)  the path must be along a field line and the area must be perpendicular to the field line 
D)  the path must be the boundary of the area 
E)  the path must lie in the area, away from its boundary 
A)  the path must pierce the area 
B)  the path must be well-separated from the area 
C)  the path must be along a field line and the area must be perpendicular to the field line 
D)  the path must be the boundary of the area 
E)  the path must lie in the area, away from its boundary

Question 7

One of the Maxwell equations begins with   .... The symbol "   " means:

Accepted Answer

A)  an infinitesimal displacement of a charge 
B)  an infinitesimal displacement of a magnetic pole 
C)  an infinitesimal inductance 
D)  an infinitesimal surface area 
E)  none of the above 
A)  an infinitesimal displacement of a charge 
B)  an infinitesimal displacement of a magnetic pole 
C)  an infinitesimal inductance 
D)  an infinitesimal surface area 
E)  none of the above

Question 8

Ferromagnetism is closely associated with:

Accepted Answer

A)  the tendency of electron dipole moments to align with an applied magnetic field 
B)  the tendency of electron dipole moments to align opposite to an applied magnetic field 
C)  the tendency of electron dipole moments to change magnitude in an applied magnetic field 
D)  the tendency of electron dipole moments to align with each other 
E)  the force exerted by electron dipole moments on each other 
A)  the tendency of electron dipole moments to align with an applied magnetic field 
B)  the tendency of electron dipole moments to align opposite to an applied magnetic field 
C)  the tendency of electron dipole moments to change magnitude in an applied magnetic field 
D)  the tendency of electron dipole moments to align with each other 
E)  the force exerted by electron dipole moments on each other

Question 9

Which of the following equations, along with a symmetry argument, can be used to calculate the magnetic field produced by a uniform time-varying electric field?

Accepted Answer

A)    
B)    
C)    
D)    
E)  none of these 
A)    
B)    
C)    
D)    
E)  none of these

Question 10

The spin magnetic dipole moment of an electron:

Accepted Answer

A)  is in the same direction as the spin angular momentum 
B)  is zero 
C)  has an magnitude that depend on the orbital angular momentum 
D)  has a magnitude that depends on the applied magnetic field 
E)  none of the above 
A)  is in the same direction as the spin angular momentum 
B)  is zero 
C)  has an magnitude that depend on the orbital angular momentum 
D)  has a magnitude that depends on the applied magnetic field 
E)  none of the above

Question 11

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 12

Because ferromagnets exhibit hysteresis, the magnetization:

Accepted Answer

A)  can never be in the same direction as an applied field 
B)  may not vanish when an applied field is reduced to zero 
C)  can never vanish 
D)  is proportional to any applied magnetic field 
E)  is always opposite to the direction of any applied magnetic field 
A)  can never be in the same direction as an applied field 
B)  may not vanish when an applied field is reduced to zero 
C)  can never vanish 
D)  is proportional to any applied magnetic field 
E)  is always opposite to the direction of any applied magnetic field

Question 13

The statement that magnetic field lines form closed loops is a direct consequence of:

Accepted Answer

A)  Faraday's law 
B)  Ampere's law 
C)  Gauss' law for electricity 
D)  Gauss' law for magnetism 
E)  the Lorentz force 
A)  Faraday's law 
B)  Ampere's law 
C)  Gauss' law for electricity 
D)  Gauss' law for magnetism 
E)  the Lorentz force

Question 14

Four closed surfaces are shown. 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 15

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 16

When a permanent magnet is strongly heated:

Accepted Answer

A)  nothing happens 
B)  it becomes an induced magnet 
C)  it loses its magnetism 
D)  its magnetism increases 
E)  its polarity reverses 
A)  nothing happens 
B)  it becomes an induced magnet 
C)  it loses its magnetism 
D)  its magnetism increases 
E)  its polarity reverses

Question 17

If an electron has an orbital angular momentum with magnitude L the magnitude of the orbital contribution to its magnetic dipole moment is given by:

Accepted Answer

A)  eL/m 
B)  eL/2m 
C)  2eL/m 
D)  mL/e 
E)  mL/2 
A)  eL/m 
B)  eL/2m 
C)  2eL/m 
D)  mL/e 
E)  mL/2

Question 18

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 19

A small bar magnet is suspended horizontally by a string. When placed in a uniform horizontal magnetic field, it will:

Accepted Answer

A)  translate in the direction of   
B)  translate in the opposite direction of   
C)  rotate so as to be at right angles to   
D)  rotate so as to be vertical 
E)  none of the above 
A)  translate in the direction of   
B)  translate in the opposite direction of   
C)  rotate so as to be at right angles to   
D)  rotate so as to be vertical 
E)  none of the above

Question 20

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

Exam 32: Maxwells Equations; Magnetism of Matter

The magnitude of the Bohr magneton in J/T is about:

Lenz' law can explain:

Consider the four Maxwell equations: Which of these must be modified if magnetic poles are discovered?

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

The polarity of an unmarked magnet can be determined using:

Two of Maxwell's equations contain a path integral on the left side and an area integral on the right. For them:

One of the Maxwell equations begins with .... The symbol " " means:

Ferromagnetism is closely associated with:

Which of the following equations, along with a symmetry argument, can be used to calculate the magnetic field produced by a uniform time-varying electric field?

The spin magnetic dipole moment of an electron:

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:

Because ferromagnets exhibit hysteresis, the magnetization:

The statement that magnetic field lines form closed loops is a direct consequence of:

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

When a permanent magnet is strongly heated:

If an electron has an orbital angular momentum with magnitude L the magnitude of the orbital contribution to its magnetic dipole moment is given by:

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:

A small bar magnet is suspended horizontally by a string. When placed in a uniform horizontal magnetic field, it will:

The units of magnetization are:

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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: