Question 1

Magnetic dipole X is fixed and dipole Y is free to move.Dipole Y will initially:

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 translate 
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 translate

Question 2

What are the possible allowed values of the orbital magnetic quantum number mℓ of the electron?

Accepted Answer

A) 0 only 
B) 0, ±1 only 
C) any half-odd integer 
D) 0, ±1, ±2, …, up to the maximum value for that orbit 
E) It depends on the external magnetic field. 
A) 0 only 
B) 0, ±1 only 
C) any half-odd integer 
D) 0, ±1, ±2, …, up to the maximum value for that orbit 
E) It depends on the external magnetic field.

Question 3

A 1-$\mu$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

Question 4

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 5

The soft iron core in the solenoid shown is removable.Then:

Accepted Answer

A) the current will be larger without the core 
B) the current will be larger with the core 
C) one must do work to remove the core 
D) the circuit will do work in expelling the core 
E) the stored energy is the same with or without the core 
A) the current will be larger without the core 
B) the current will be larger with the core 
C) one must do work to remove the core 
D) the circuit will do work in expelling the core 
E) the stored energy is the same with or without the core

Question 6

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 7

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 8

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 9

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 10

Gauss' law for magnetism:

Accepted Answer

A) can be used to find due to given currents provided there is enough symmetry 
B) is false because there are no magnetic poles 
C) can be used with open surfaces because there are no magnetic poles 
D) contradicts Faraday's law because one says $\phi$B = 0 and the other says = -d$\phi$B/dt 
E) none of the above 
A) can be used to find due to given currents provided there is enough symmetry 
B) is false because there are no magnetic poles 
C) can be used with open surfaces because there are no magnetic poles 
D) contradicts Faraday's law because one says $\phi$B = 0 and the other says = -d$\phi$B/dt 
E) none of the above

Question 11

The magnetic field lines due to an ordinary bar magnet:

Accepted Answer

A) form closed curves 
B) cross one another near the poles 
C) are more numerous near the N pole than near the S pole 
D) leave the S pole, loop around the outside of the magnet, and enter the N pole 
E) none of the above 
A) form closed curves 
B) cross one another near the poles 
C) are more numerous near the N pole than near the S pole 
D) leave the S pole, loop around the outside of the magnet, and enter the N pole 
E) none of the above

Question 12

What are the possible allowed values of the spin magnetic quantum number ms of the electron?

Accepted Answer

A) +1/2 only 
B) ±1/2 
C) any half-odd integer 
D) any integer 
E) It depends on the external magnetic field. 
A) +1/2 only 
B) ±1/2 
C) any half-odd integer 
D) any integer 
E) It depends on the external magnetic field.

Question 13

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 field lines of the induced magnetic field are:

Accepted Answer

A) circles 
B) ellipses 
C) straight lines parallel to the electric field 
D) straight lines perpendicular to the electric field 
E) none of the above 
A) circles 
B) ellipses 
C) straight lines parallel to the electric field 
D) straight lines perpendicular to the electric field 
E) none of the above

Question 14

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 15

Which of the following statements about the Earth's magnetic field is correct?

Accepted Answer

A) The Earth's magnetic field is approximately that of a dipole, and the north magnetic pole is in the northern hemisphere. 
B) The Earth's magnetic field is approximately that of a dipole, and the north magnetic pole is in the southern hemisphere. 
C) The Earth's magnetic field is approximately that of a monopole, and the north magnetic pole is in the northern hemisphere. 
D) The Earth's magnetic field is approximately that of a monopole, and the north magnetic pole is in the southern hemisphere. 
E) The Earth's magnetic field is approximately that of a quadrupole, and the north magnetic pole is in the eastern hemisphere. 
A) The Earth's magnetic field is approximately that of a dipole, and the north magnetic pole is in the northern hemisphere. 
B) The Earth's magnetic field is approximately that of a dipole, and the north magnetic pole is in the southern hemisphere. 
C) The Earth's magnetic field is approximately that of a monopole, and the north magnetic pole is in the northern hemisphere. 
D) The Earth's magnetic field is approximately that of a monopole, and the north magnetic pole is in the southern hemisphere. 
E) The Earth's magnetic field is approximately that of a quadrupole, and the north magnetic pole is in the eastern hemisphere.

Question 16

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 17

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 18

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 19

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 20

A paramagnetic substance, in an external magnetic field, is thermally isolated.The field is then removed.As a result:

Accepted Answer

A) the magnetic energy of the magnetic dipoles decreases 
B) the temperature of the substance increases 
C) the magnetization decreases, but only slightly 
D) the magnetization reverses direction 
E) none of the above 
A) the magnetic energy of the magnetic dipoles decreases 
B) the temperature of the substance increases 
C) the magnetization decreases, but only slightly 
D) the magnetization reverses direction 
E) none of the above

Exam 32: Maxwells Equations; Magnetism of Matter

Magnetic dipole X is fixed and dipole Y is free to move.Dipole Y will initially:

What are the possible allowed values of the orbital magnetic quantum number mℓ of the electron?

A 1- μ\muμ 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:

Because ferromagnets exhibit hysteresis, the magnetization:

The soft iron core in the solenoid shown is removable.Then:

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

Ferromagnetism is closely associated with:

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:

Gauss' law for magnetism, , tells us:

Gauss' law for magnetism:

The magnetic field lines due to an ordinary bar magnet:

What are the possible allowed values of the spin magnetic quantum number ms of the electron?

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 field lines of the induced magnetic field are:

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:

Which of the following statements about the Earth's magnetic field is correct?

Displacement current is:

Lenz' law can explain:

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:

Displacement current exists wherever there is:

A paramagnetic substance, in an external magnetic field, is thermally isolated.The field is then removed.As a result:

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What are the possible allowed values of the orbital magnetic quantum number m_ℓ of the electron?

A 1- $\mu$ 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:

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:

What are the possible allowed values of the spin magnetic quantum number m_s of the electron?