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13 Cards in this Set

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(i) A charged particle is moving perpendicular to a magnetic field in a circle with a radius r. The magnitude of the magnetic field is increased. Compared with the initial radius of the circular path, is the radius of the new path

1. equal in size?

smaller (The increase in magnitude of magnetic field, the decrease in radius.)

An identical particle enters the field, with perpendicular to , but with a higher speed v than the first particle. Compared with the radius of the circle for the first particle in the same magnetic field, is the radius of the circle for the second particle

1. equal in size?

2. larger (The greater the velocity, the smaller the radius.)


What is the direction of the magnetic field at the point P, directly below a point at the center of the magnet?  The numbered arrows represent various directions.  Direction “1” is to the right, “2” to the left, “3” is upward, “4” ...

What is the direction of the magnetic field at the point P, directly below a point at the center of the magnet? The numbered arrows represent various directions. Direction “1” is to the right, “2” to the left, “3” is upward, “4” is downward, and “5” is toward you.


a) 1


b) 2


c) 3


d) 4


e) 5

a.

A negatively-charged particle travels parallel to magnetic field lines within a region of space. Which one of the following statements concerning the force exerted on the particle is true?


a) The force is directed perpendicular to the magnetic field.


b) The force is perpendicular to the direction in which the particle is moving.


c) The force slows the particle.


d) The force accelerates the particle.


e) The force has a magnitude of zero newtons.

e.

A positively-charged particle is stationary in a constant magnetic field within a region of space. Which one of the following statements concerning the particle is true?


a) The particle will not move.


b) The particle will accelerate in the direction perpendicular to the field.


c) The particle will accelerate in the direction parallel to the field.


d) The particle will accelerate in the direction opposite to the field.


e) The particle will move with constant velocity in the direction of the field.

a.

An electron traveling due east in a region that contains only a magnetic field experiences a vertically downward force, toward the surface of the earth. What is the direction of the magnetic field?


a) upward, away from the earth


b) downward, toward the earth


c) due north


d) due west


e) due south

c.

A charged particle is moving through a constant magnetic field. Does the magnetic field do work on the charged particle?


a) yes, because the force is acting as the particle is moving through some distance


b) no, because the magnetic force is always perpendicular to the velocity of the particle


c) no, because the magnetic field is a vector and work is a scalar quantity


d) no, because the magnetic field is conservative


e) no, because the magnetic force is a velocity-dependent force

b.

An electron is traveling due south in a region of space at a constant speed. What can you conclude from this situation regarding the presence any electric and/or magnetic fields?


a) The electric field must be zero, but the magnetic field might be non-zero in the region.


b) The magnetic field must be zero, but the electric field might be non-zero in the region.


c) Both the electric and magnetic field might be non-zero, but they are perpendicular to each other in the region.


d) Both the electric and magnetic field might be non-zero, but they


point in opposite directions in the region.


e) Both the electric and magnetic field must be zero in the region.

c.

Ernest O. Lawrence, of the University of California, Berkeley, invented the cyclotron in 1929. A more modern version was completed in 1961 at the Lawrence-Livermore Laboratory that has a radius of 88 inches. What is the frequency of circular motion at the “88-incher” if protons are circulating in a magnetic field of 0.48 T?


a) 1.4 × 106 Hz


b) 4.5 × 106 Hz


c) 7.3 × 106 Hz


d) 3.6 × 105 Hz


e) 9.7 × 104 Hz

c.

A portion of a loop of wire passes between the poles of a magnet as shown. We are viewing the circuit from above. When the switch is closed and a current passes through the circuit, what is the movement, if any, of the wire between the poles of the magnet?


a) The wire moves toward the north pole of the magnet.


b) The wire moves toward the south pole of the magnet.


c) The wire moves upward (toward us).


d) The wire moves downward (away from us).


e) The wire doesn’t move.

d. WHY?

Small charged disks are inserted into a larger, insulating disk. A compass is placed near the larger disk and points due north as shown. The larger disk is then rotated uniformly counterclockwise (as viewed from above). What, if anything, will happen?


a) The north end of the compass will


move toward the large disk as it rotates.


b) The north end of the compass will


move away from the large disk as it


rotates.


c) The compass will not be affected by the motion of the large disk.


d) The north end of the compass will oscillate toward and away from the large disk as it rotates.

c.

A circular loop of wire is placed in a magnetic field such that the plane of the loop is perpendicular to the magnetic field. The loop is then connected to a battery and a current then flows through the loop. Which one of the following statements concerning this situation is true?


a) The magnetic force exerts a net torque


on the loop.


b) The magnetic force exerts a net force


on the loop.


c) The magnetic force exerts both a net force and a net torque on the loop.


d) The magnetic field has no affect on the loop.

a.

Consider the relationships between the directions of the torque acting on a magnetic dipole in a magnetic field, the magnetic field, and the magnetic dipole moment. Which one of the following statements regarding these directions is true?


a) The torque is parallel to both the magnetic field and the dipole moment.


b) The torque is perpendicular to the magnetic field, but parallel to the dipole moment.


c) The torque is parallel to the magnetic field, but perpendicular to the dipole moment.


d) The torque is perpendicular to both the magnetic field and the dipole moment.

d.