A metal ring is dropped into a localized region of constant magnetic field, as indicated in FIGURE 23-36. The magnetic field is zero above and below the region where it is finite.

(a) For each of the three indicated locations 11, 2, and 32, is the induced current clockwise, counterclockwise, or zero?

(b) Choose the best explanation from among the following:

I. Clockwise at 1 to oppose the field; zero at 2 because the field is uniform; counterclockwise at 3 to try to maintain the field.

II. Counterclockwise at 1 to oppose the field; zero at 2 because the field is uniform; clockwise at 3 to try to maintain the field.

III. Clockwise at 1 to oppose the field; clockwise at 2 to maintain the field; clockwise at 3 to oppose the field.

FIGURE 23-36.