Question 1

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 B

Question 2

Maxwell's equations, along with an appropriate symmetry argument, can be used to calculate:

Accepted Answer

A)  the electric force on a given charge 
B)  the magnetic force on a given moving charge 
C)  the flux of a given electric field 
D)  the flux of a given magnetic field 
E)  none of these 
A)  the electric force on a given charge 
B)  the magnetic force on a given moving charge 
C)  the flux of a given electric field 
D)  the flux of a given magnetic field 
E)  none of these E

Question 3

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 C

Question 4

Which of the following equations can be used to show that magnetic field lines form closed loops?

Accepted Answer

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

Question 5

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 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

A bar magnet is placed vertically with its S pole up and its N pole down. Its   field at its center is:

Accepted Answer

A)  zero 
B)  down 
C)  up due to the weight of the magnet 
D)  horizontal 
E)  slightly below the horizontal 
A)  zero 
B)  down 
C)  up due to the weight of the magnet 
D)  horizontal 
E)  slightly below the horizontal

Question 8

Two of Maxwell's equations contain a path integral on the left side and an area integral on the right. The directions of the infinitesimal path element   and infinitesimal area element   are:

Accepted Answer

A)  always in the same direction 
B)  always in opposite directions 
C)  always perpendicular to each other 
D)  never perpendicular to each other 
E)  none of the above 
A)  always in the same direction 
B)  always in opposite directions 
C)  always perpendicular to each other 
D)  never perpendicular to each other 
E)  none of the above

Question 9

If an electron has zero orbital angular momentum, the magnitude of its magnetic dipole moment equals:

Accepted Answer

A)  zero 
B)  half the Bohr magneton 
C)  a Bohr magneton 
D)  twice a Bohr magneton 
E)  none of these 
A)  zero 
B)  half the Bohr magneton 
C)  a Bohr magneton 
D)  twice a Bohr magneton 
E)  none of these

Question 10

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

Accepted Answer

A)  0 
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)  0 
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 11

One of the Maxwell equations begins with   .... The "o" symbol in the integral sign means:

Accepted Answer

A)  the same as the subscript in $\mu$0 
B)  integrate clockwise around the path 
C)  integrate counterclockwise around the path 
D)  integrate around a closed path 
E)  integrate over a closed surface 
A)  the same as the subscript in $\mu$0 
B)  integrate clockwise around the path 
C)  integrate counterclockwise around the path 
D)  integrate around a closed path 
E)  integrate over a closed surface

Question 12

Gauss' law for magnetism tells us:

Accepted Answer

A)  the net charge in any given volume 
B)  that the line integral of a magnetic field around any closed loop must vanish 
C)  the magnetic field of a current element 
D)  that magnetic monopoles do not exist 
E)  charges must be moving to produce magnetic fields 
A)  the net charge in any given volume 
B)  that the line integral of a magnetic field around any closed loop must vanish 
C)  the magnetic field of a current element 
D)  that magnetic monopoles do not exist 
E)  charges must be moving to produce magnetic fields

Question 13

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 0.25 m from the axis has a magnitude of:

Accepted Answer

A)  0 
B)  7.0 * 10-6 T 
C)  2.8 * 10-5 T 
D)  5.4 * 10-5 T 
E)  7.0* 10-5 T 
A)  0 
B)  7.0 * 10-6 T 
C)  2.8 * 10-5 T 
D)  5.4 * 10-5 T 
E)  7.0* 10-5 T

Question 14

Magnetization is:

Accepted Answer

A)  the current density in an object 
B)  the charge density of moving charges in an object 
C)  the magnetic dipole moment of an object 
D)  the magnetic dipole moment per unit volume of an object 
E)  the magnetic field per unit volume produced by an object 
A)  the current density in an object 
B)  the charge density of moving charges in an object 
C)  the magnetic dipole moment of an object 
D)  the magnetic dipole moment per unit volume of an object 
E)  the magnetic field per unit volume produced by an object

Question 15

A magnetic field exists between the plates of a capacitor:

Accepted Answer

A)  always 
B)  never 
C)  when the capacitor is fully charged 
D)  while the capacitor is being charged 
E)  only when the capacitor is starting to be charged 
A)  always 
B)  never 
C)  when the capacitor is fully charged 
D)  while the capacitor is being charged 
E)  only when the capacitor is starting to be charged

Question 16

Two of Maxwell's equations contain a path integral on the left side and an area integral on the right. Suppose the area is the surface of a piece of paper at which you are looking and   is chosen to point toward you. Then, the path integral is:

Accepted Answer

A)  clockwise around the circumference of the paper 
B)  counterclockwise around the circumference of the paper 
C)  from left to right 
D)  from right to left 
E)  from top to bottom 
A)  clockwise around the circumference of the paper 
B)  counterclockwise around the circumference of the paper 
C)  from left to right 
D)  from right to left 
E)  from top to bottom

Question 17

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 18

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 19

Suppose you are looking into one end of a long cylindrical tube in which there is a uniform electric field, pointing away from you. If the magnitude of the field is decreasing with time the direction of the induced magnetic field is:

Accepted Answer

A)  toward you 
B)  away from you 
C)  clockwise 
D)  counterclockwise 
E)  to your right 
A)  toward you 
B)  away from you 
C)  clockwise 
D)  counterclockwise 
E)  to your right

Question 20

Displacement current exists wherever there is:

Accepted Answer

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

Exam 32: Maxwells Equations; Magnetism of Matter

Displacement current is:

Maxwell's equations, along with an appropriate symmetry argument, can be used to calculate:

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

Which of the following equations can be used to show that magnetic field lines form closed loops?

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

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

A bar magnet is placed vertically with its S pole up and its N pole down. Its field at its center is:

Two of Maxwell's equations contain a path integral on the left side and an area integral on the right. The directions of the infinitesimal path element and infinitesimal area element are:

If an electron has zero orbital angular momentum, the magnitude of its magnetic dipole moment equals:

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

One of the Maxwell equations begins with .... The "o" symbol in the integral sign means:

Gauss' law for magnetism tells us:

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 0.25 m from the axis has a magnitude of:

Magnetization is:

A magnetic field exists between the plates of a capacitor:

Two of Maxwell's equations contain a path integral on the left side and an area integral on the right. Suppose the area is the surface of a piece of paper at which you are looking and is chosen to point toward you. Then, the path integral is:

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

The units of magnetization are:

Suppose you are looking into one end of a long cylindrical tube in which there is a uniform electric field, pointing away from you. If the magnitude of the field is decreasing with time the direction of the induced magnetic field is:

Displacement current exists wherever there is:

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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 0.25 m from the axis has a magnitude of: