1.) Figure 20.6 is a graph of the magnitude B versus time  for a magnetic field that passes through a fixed loop and is oriented  perpendicular to the plane of the loop. Rank the magnitudes of the emf  generated in the loop at the three instants indicated from largest to  smallest.

Select one:

1. b, c, a

2. c, b, a

3. b, a, c

4. c, a, b

5. a, b, c

6. a, c, b

2.) A bar magnet is  falling toward the center of a loop of wire, with the north pole  oriented downward. Viewed from the same side of the loop as the magnet,  as the north pole approaches the loop, what is the direction of the  induced current?  

Select one:

a. along the length of the magnet

b. zero

c. counterclockwise

d. clockwise

3.) Two circular loops are side by side and lie in the xy-plane.  A switch is closed, starting a counterclockwise current in the  left-hand loop, as viewed from a point on the positive z-axis passing  through the center of the loop. Which of the following statements is  true of the right-hand loop?

Select one:

a. An induced current moves clockwise.

b. The current remains zero.

c. An induced current moves counterclockwise.

4.) You intend to move  a rectangular loop of wire into a region of uniform mag- netic field at  a given speed so as to induce an emf in the loop. The plane of the loop  must remain perpendicular to the magnetic field lines. In which  orientation should you hold the loop while you move it into the region  with the magnetic field to generate the largest emf?

Select one:

1. (a) with the long dimension of the loop parallel to the velocity vector

2. (b) with the short dimension of the loop parallel to the velocity vector

3. (c) either way because the emf is the same regardless of orientation