Cutnell/Johnson Physics 7 th edition

1. Cutnell/JohnsonPhysics 7th edition • Classroom Response System Questions Chapter 32 Maxwell’s Equations: Magnetism of Matter Reading Quiz Questions

2. 32.2.1. Complete the following statement: According to today’s scientists, magnetic monopoles a) have no mass. b) have no charge. c) are found in abundance in the most distant parts of the universe. d) do not exist anywhere in the universe. e) are the antiparticles for magnetic dipoles.

3. 32.2.1. Complete the following statement: According to today’s scientists, magnetic monopoles a) have no mass. b) have no charge. c) are found in abundance in the most distant parts of the universe. d) do not exist anywhere in the universe. e) are the antiparticles for magnetic dipoles.

4. 32.2.2. What would you get if you took a bar magnet and cut it in half? a) two pieces, one a north pole and one a south pole b) two shorter magnets, each with a north pole and a south pole c) two pieces, both non-magnetic d) a molten mess from the energy released from within the magnet upon cutting e) an electric shock

5. 32.2.2. What would you get if you took a bar magnet and cut it in half? a) two pieces, one a north pole and one a south pole b) two shorter magnets, each with a north pole and a south pole c) two pieces, both non-magnetic d) a molten mess from the energy released from within the magnet upon cutting e) an electric shock

6. 32.2.3. Which of the following choices concerning the net magnetic flux through any enclosed surface is true according to Gauss’ law for magnetic fields? a) The net magnetic flux in this case would be a vector quantity equal to the enclosed magnetic field. b) The net magnetic flux in this case would be a vector quantity equal to the number of magnetic monopoles passing through the surface per unit time. c) The net magnetic flux in this case would be a positive scalar quantity. d) The net magnetic flux in this case would be equal to zero. e) The net magnetic flux in this case would be a negative scalar quantity.

7. 32.2.3. Which of the following choices concerning the net magnetic flux through any enclosed surface is true according to Gauss’ law for magnetic fields? a) The net magnetic flux in this case would be a vector quantity equal to the enclosed magnetic field. b) The net magnetic flux in this case would be a vector quantity equal to the number of magnetic monopoles passing through the surface per unit time. c) The net magnetic flux in this case would be a positive scalar quantity. d) The net magnetic flux in this case would be equal to zero. e) The net magnetic flux in this case would be a negative scalar quantity.

8. 32.3.1. What is produced from a changing electric field? a) an electric field directed perpendicularly to the changing field b) a magnetic flux c) a magnetic field directed perpendicularly to the changing field d) lightning e) an electric field directed parallel to the changing field

9. 32.3.1. What is produced from a changing electric field? a) an electric field directed perpendicularly to the changing field b) a magnetic flux c) a magnetic field directed perpendicularly to the changing field d) lightning e) an electric field directed parallel to the changing field

10. 32.3.2. A parallel plate capacitor is being charged by a constant current i. During the charging, the electric field within the plates is increasing with time. Which one of the following statements concerning the magnetic field between the plates is true? a) The magnetic field within a parallel plate capacitor is always equal to zero tesla. b) The induced magnetic field is directed antiparallel to the increasing electric field. c) The induced magnetic field strength has its largest value at the center of the plates and decreases linearly toward the edges of the plates. d) The induced magnetic field strength has the same magnitude within the plates of the capacitor, except near the edges, at a given time. e) The induced magnetic field strength is zero tesla near the center of the plates and increases as r increases toward the edges of the plates.

11. 32.3.2. A parallel plate capacitor is being charged by a constant current i. During the charging, the electric field within the plates is increasing with time. Which one of the following statements concerning the magnetic field between the plates is true? a) The magnetic field within a parallel plate capacitor is always equal to zero tesla. b) The induced magnetic field is directed antiparallel to the increasing electric field. c) The induced magnetic field strength has its largest value at the center of the plates and decreases linearly toward the edges of the plates. d) The induced magnetic field strength has the same magnitude within the plates of the capacitor, except near the edges, at a given time. e) The induced magnetic field strength is zero tesla near the center of the plates and increases as r increases toward the edges of the plates.

12. 32.4.1. What is a displacement current? a) a fictitious current across the plates of a capacitor b) charged particles moving in a changing magnetic field c) charged particle moving in a changing electric field d) the movement of the positive nuclei within atoms in response to a changing electric field e) the movement of the positive nuclei within atoms in response to a changing magnetic field

13. 32.4.1. What is a displacement current? a) a fictitious current across the plates of a capacitor b) charged particles moving in a changing magnetic field c) charged particle moving in a changing electric field d) the movement of the positive nuclei within atoms in response to a changing electric field e) the movement of the positive nuclei within atoms in response to a changing magnetic field

14. 32.4.2. By making use of the concept of displacement current, we can find the induced magnetic field strength within a charging capacitor. Consider a parallel plate capacitor with circular plates of radius R. Which of the following expressions gives the correct relationship between the induced magnetic field strength B at radius r from the center? a) b) c) B = constant d) e)

15. 32.4.2. By making use of the concept of displacement current, we can find the induced magnetic field strength within a charging capacitor. Consider a parallel plate capacitor with circular plates of radius R. Which of the following expressions gives the correct relationship between the induced magnetic field strength B at radius r from the center? a) b) c) B = constant d) e)

16. 32.5.1. Which one of the following is not one of Maxwell’s fundamental equations of electromagnetism? a) Gauss’ law for electricity b) Coulomb’s law c) Faraday’s law d) Ampere-Maxwell law e) Gauss’ law for magnetism

17. 32.5.1. Which one of the following is not one of Maxwell’s fundamental equations of electromagnetism? a) Gauss’ law for electricity b) Coulomb’s law c) Faraday’s law d) Ampere-Maxwell law e) Gauss’ law for magnetism

18. 32.6.1. Which one of the following choices is the generally accepted reason for the changing of the Earth’s magnetic field over time? a) The field has changed because the Hubble constant has changed. b) The field has changed as the Earth has gone through numerous global warming and cooling cycles. c) The field has changed as the Earth’s rotation has slowed down over time. d) The field has changed as a result of numerous asteroid collisions with the Earth over time. e) The reason for the changing field has yet to be determined.

19. 32.6.1. Which one of the following choices is the generally accepted reason for the changing of the Earth’s magnetic field over time? a) The field has changed because the Hubble constant has changed. b) The field has changed as the Earth has gone through numerous global warming and cooling cycles. c) The field has changed as the Earth’s rotation has slowed down over time. d) The field has changed as a result of numerous asteroid collisions with the Earth over time. e) The reason for the changing field has yet to be determined.

20. 32.6.2. The direction of the magnetic field at any location of the Earth’s surface is commonly specified in terms of two field angles. What are the names given to these two angles? a) latitude and longitude b) oblique and obtuse c) dihedral and euclidean d) squine and novile e) declination and inclination

21. 32.6.2. The direction of the magnetic field at any location of the Earth’s surface is commonly specified in terms of two field angles. What are the names given to these two angles? a) latitude and longitude b) oblique and obtuse c) dihedral and euclidean d) squine and novile e) declination and inclination

22. 32.6.3. What are the stones called that were initially discovered by the ancient Greek and Chinese peoples that are naturally occurring magnetic materials? a) pyrite b) lodestones c) compass stones d) sorcerer stone e) hematite

23. 32.6.3. What are the stones called that were initially discovered by the ancient Greek and Chinese peoples that are naturally occurring magnetic materials? a) pyrite b) lodestones c) compass stones d) sorcerer stone e) hematite

24. 32.7.1. Which of the following is most responsible for the magnetic behavior of materials? a) neutrons b) protons c) photons d) electrons e) phonons

25. 32.7.1. Which of the following is most responsible for the magnetic behavior of materials? a) neutrons b) protons c) photons d) electrons e) phonons

26. 32.7.2. Which one of the following statements concerning the measured values of the spin angular momentum is true? a) The measured component of the spin angular momentum can only have one of two possible values that differ only in the sign. b) The spin angular momentum can be oriented only in the direction an electron is moving. c) The spin angular momentum can be easily measured in today’s laboratories. d) The spin angular momentum is the same thing as angular momentum, except that it is the angular momentum of an electron. e) The spin angular momentum does not contribute to the magnetic properties of materials.

27. 32.7.2. Which one of the following statements concerning the measured values of the spin angular momentum is true? a) The measured component of the spin angular momentum can only have one of two possible values that differ only in the sign. b) The spin angular momentum can be oriented only in the direction an electron is moving. c) The spin angular momentum can be easily measured in today’s laboratories. d) The spin angular momentum is the same thing as angular momentum, except that it is the angular momentum of an electron. e) The spin angular momentum does not contribute to the magnetic properties of materials.

28. 32.8.1. Which one of the following statements is true for paramagnetic materials? a) The atoms have no permanent magnetic dipole moments under any condition. b) The atoms have permanent magnetic dipole moments that are mostly aligned with each other. c) The atoms have permanent magnetic dipole moments that are randomly oriented. d) The atoms have permanent magnetic dipole moments that are aligned either parallel or antiparallel with each other. e) The atoms have dipole moments that align in opposition to an applied magnetic field, but otherwise have no permanent dipole moments.

29. 32.8.1. Which one of the following statements is true for paramagnetic materials? a) The atoms have no permanent magnetic dipole moments under any condition. b) The atoms have permanent magnetic dipole moments that are mostly aligned with each other. c) The atoms have permanent magnetic dipole moments that are randomly oriented. d) The atoms have permanent magnetic dipole moments that are aligned either parallel or antiparallel with each other. e) The atoms have dipole moments that align in opposition to an applied magnetic field, but otherwise have no permanent dipole moments.

30. 32.8.2. Which of the following terms is used to describe materials that have regions in which strong magnetic dipole moments are aligned with each other? a) diamagnetic b) paramagnetic c) ferromagnetic d) ferrimagnetic e) gaussetic

31. 32.8.2. Which of the following terms is used to describe materials that have regions in which strong magnetic dipole moments are aligned with each other? a) diamagnetic b) paramagnetic c) ferromagnetic d) ferrimagnetic e) gaussetic

32. 32.8.3. What produces the magnetism of an individual atom? a) the nuclear force that holds protons within the atomic nucleus b) the orbital and spin motions of electrons c) the motion of the atom itself d) the electric interaction between electrons and protons e) neutrons are naturally magnetic

33. 32.8.3. What produces the magnetism of an individual atom? a) the nuclear force that holds protons within the atomic nucleus b) the orbital and spin motions of electrons c) the motion of the atom itself d) the electric interaction between electrons and protons e) neutrons are naturally magnetic

34. 32.9.1. Which of the following terms is used to describe materials that have weak induced magnetic dipole moments that are directed in the opposite direction to an applied external magnetic field? a) diamagnetic b) paramagnetic c) ferromagnetic d) ferrimagnetic e) gaussetic

35. 32.9.1. Which of the following terms is used to describe materials that have weak induced magnetic dipole moments that are directed in the opposite direction to an applied external magnetic field? a) diamagnetic b) paramagnetic c) ferromagnetic d) ferrimagnetic e) gaussetic

36. 32.11.1. What is the name given to the quantum mechanical effect that gives rise to ferromagnetism in materials, such as iron, cobalt, and nickel? a) parity b) nuclear magnetic resonance c) cooper pairing d) quantization e) exchange coupling

37. 32.11.1. What is the name given to the quantum mechanical effect that gives rise to ferromagnetism in materials, such as iron, cobalt, and nickel? a) parity b) nuclear magnetic resonance c) cooper pairing d) quantization e) exchange coupling

38. 32.11.2. Which one of the following materials is not ferromagnetic? a) cobalt b) nickel c) gadolinium d) iron e) aluminum

39. 32.11.2. Which one of the following materials is not ferromagnetic? a) cobalt b) nickel c) gadolinium d) iron e) aluminum