Question 1

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 2

A 1-  F capacitor is connected to an emf that is increasing uniformly with time at a rate of 100 V/s.The displacement current between the plates is:

Accepted Answer

A) 0 A 
B) 1 * 10-8 A 
C) 1 *10-6 A 
D) 1 *10-4 A 
E) 100 A 
A) 0 A 
B) 1 * 10-8 A 
C) 1 *10-6 A 
D) 1 *10-4 A 
E) 100 A D

Question 3

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 B

Question 4

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 5

Which of the following equations can be used, along with a symmetry argument, to calculate the electric field of a point charge?

Accepted Answer

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

Question 6

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 7

Which of the following statements is correct?

Accepted Answer

A) The declination of the Earth's magnetic field is the angle between a horizontal plane and the direction of the field. 
B) The declination of the Earth's magnetic field is the angle between a vertical plane and the direction of the field. 
C) The inclination of the Earth's magnetic field is the angle between a horizontal plane and the direction of the field. 
D) The inclination of the Earth's magnetic field is the angle between the horizontal component of the field direction and the direction to geographic north. 
E) Inclination and declination mean the same thing. 
A) The declination of the Earth's magnetic field is the angle between a horizontal plane and the direction of the field. 
B) The declination of the Earth's magnetic field is the angle between a vertical plane and the direction of the field. 
C) The inclination of the Earth's magnetic field is the angle between a horizontal plane and the direction of the field. 
D) The inclination of the Earth's magnetic field is the angle between the horizontal component of the field direction and the direction to geographic north. 
E) Inclination and declination mean the same thing.

Question 8

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 9

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

Accepted Answer

A) zero 
B) down 
C) up 
D) horizontal 
E) slightly below the horizontal 
A) zero 
B) down 
C) up 
D) horizontal 
E) slightly below the horizontal

Question 10

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 11

The intrinsic magnetic dipole moments of protons and neutrons are much less than that of an electron because:

Accepted Answer

A) their masses are greater 
B) their angular momenta are much less 
C) their angular momenta are much greater 
D) their charges are much less 
E) their radii are much less 
A) their masses are greater 
B) their angular momenta are much less 
C) their angular momenta are much greater 
D) their charges are much less 
E) their radii are much less

Question 12

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

Accepted Answer

A) the same as the subscript in   
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   
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 13

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 14

A cylindrical region contains a uniform electric field that is along the cylinder axis and is changing with time.If r is the distance from the cylinder axis the magnitude of the magnetic field within the region is:

Accepted Answer

A) uniform 
B) proportional to 1/r 
C) proportional to r2 
D) proportional to 1/r2 
E) proportional to r 
A) uniform 
B) proportional to 1/r 
C) proportional to r2 
D) proportional to 1/r2 
E) proportional to r

Question 15

Magnetic dipole X is fixed.Dipole Y is placed in the position indicated and is free to move.The first thing dipole Y will do is:

Accepted Answer

A) move toward X but not rotate 
B) move away from X but not rotate 
C) move toward X and rotate 
D) move away from X and rotate 
E) rotate but not move toward or away from X 
A) move toward X but not rotate 
B) move away from X but not rotate 
C) move toward X and rotate 
D) move away from X and rotate 
E) rotate but not move toward or away from X

Question 16

A current of 1 A is used to charge a parallel plate capacitor with square plates.If the area of each plate is 0.6 m2 the displacement current through a 0.3 m2 area wholly between the capacitor plates and parallel to them is:

Accepted Answer

A) 2 A 
B) 1 A 
C) 0.7 A 
D) 0.5 A 
E) 0.25 A 
A) 2 A 
B) 1 A 
C) 0.7 A 
D) 0.5 A 
E) 0.25 A

Question 17

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 T 
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 T 
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 18

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 19

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 20

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

Exam 32: Maxwells Equations; Magnetism of Matter

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

A 1- F capacitor is connected to an emf that is increasing uniformly with time at a rate of 100 V/s.The displacement current between the plates is:

The polarity of an unmarked magnet can be determined using:

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

Which of the following equations can be used, along with a symmetry argument, to calculate the electric field of a point charge?

Which of the following statements is correct?

Which of the following statements is correct?

A magnetic field exists between the plates of a capacitor:

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

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

The intrinsic magnetic dipole moments of protons and neutrons are much less than that of an electron because:

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

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

A cylindrical region contains a uniform electric field that is along the cylinder axis and is changing with time.If r is the distance from the cylinder axis the magnitude of the magnetic field within the region is:

Magnetic dipole X is fixed.Dipole Y is placed in the position indicated and is free to move.The first thing dipole Y will do is:

A current of 1 A is used to charge a parallel plate capacitor with square plates.If the area of each plate is 0.6 m2 the displacement current through a 0.3 m2 area wholly between the capacitor plates and parallel to them 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 0.25 m from the axis has a magnitude of:

Ferromagnetism is closely associated with:

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:

Because ferromagnets exhibit hysteresis, the magnetization:

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

A current of 1 A is used to charge a parallel plate capacitor with square plates.If the area of each plate is 0.6 m² the displacement current through a 0.3 m² area wholly between the capacitor plates and parallel to them 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 0.25 m from the axis has a magnitude of: