LSU PHYS 2002 Exam II Questions and Answers Fully Solved Latest Version

LSU PHYS 2002 Exam II Questions and Answers Fully Solved Latest Version Which one of the following statements concerning permanent magnets is false? A) The north pole of a permanent magnet is attracted to a south pole. B) All permanent magnets are surrounded by a magnetic field. C) The direction of a magnetic field is indicated by the north pole of a compass. D) Magnetic field lines outside a permanent magnet originate from the north pole and end on the south pole. E) When a permanent magnet is cut in half, one piece will be a north pole and one piece will be a south pole. - Answers E) When a permanent magnet is cut in half, one piece will be a north pole and one piece will be a south pole. Which combination of units can be used to express the magnetic field? A) kg × m2/C B) kg × s/C2 C) N × m2/C D) kg/(C × s) E) kg × m/(C × s2) - Answers D) kg/(C × s) Which one of the following statements concerning the magnetic force on a charged particle in a magnetic field is true? A) The magnetic force is a maximum if the particle is stationary. B) The magnetic force is zero if the particle moves perpendicular to the field. C) The magnetic force is a maximum if the particle moves parallel to the field. D) The magnetic force acts in the direction of motion for a positively charged particle. E) The magnetic force depends on the component of the particle's velocity that is perpendicular to the field. - Answers E) The magnetic force depends on the component of the particle's velocity that is perpendicular to the field. Complete the following statement: The magnitude of the magnetic force that acts on a charged particle in a magnetic field is independent of A) the sign of the charge. B) the magnitude of the charge. C) the magnitude of the magnetic field. D) the direction of motion of the particle. E) the velocity components of the particle. - Answers A) the sign of the charge. A charged particle is moving in a uniform, constant magnetic field. Which one of the following statements concerning the magnetic force exerted on the particle is false? A) The magnetic force does no work on the particle. B) The magnetic force increases the speed of the particle. C) The magnetic force changes the velocity of the particle. D) The magnetic force can act only on a particle in motion. E) The magnetic force does not change the kinetic energy of the particle. - Answers B) The magnetic force increases the speed of the particle. A proton traveling due west in a region that contains only a magnetic field experiences a vertically upward force (away from the surface of the earth). What is the direction of the magnetic field? A) north B) east C) south D) west E) down - Answers C) south Which one of the following statements best explains why a constant magnetic field can do no work on a moving charged particle? A) The magnetic field is conservative. B) The magnetic force is a velocity dependent force. C) The magnetic field is a vector and work is a scalar quantity. D) The magnetic force is always perpendicular to the velocity of the particle. E) The electric field associated with the particle cancels the effect of the magnetic field on the particle. - Answers D) The magnetic force is always perpendicular to the velocity of the particle. 9. An electron traveling due north enters a region that contains a uniform magnetic field that points due east. In which direction will the electron be deflected? A) east B) west C) up D) down E) south - Answers D) down An electron traveling due south enters a region that contains both a magnetic field and an electric field. The electric field lines point due west. It is observed that the electron continues to travel in a straight line due south. In which direction must the magnetic field lines point? A) up B) down C) east D) west E) south - Answers B) down An proton travels through a region of space with no acceleration. Which one of the following statements is the best conclusion? A) Both E and B must be zero in that region. B) E must be zero, but B might be non-zero in that region. C) E and B might both be non-zero, but they must be mutually perpendicular. D) B must be zero, but E might be non-zero in that region. E) E and B might both be non-zero, but they must point in opposite directions. - Answers C) E and B might both be non-zero, but they must be mutually perpendicular. A proton is traveling south as it enters a region that contains a magnetic field. The proton is deflected downward toward the earth. What is the direction of the magnetic field? A) downward, toward the earth B) west