Finally, the switch on the electromagnet is reopened. The magnitude of the external magnetic flux through the wire loop (A. increases, B. decreases, C. remains constant), and there is (A. zero, B. a clockwise, C. a counterclockwise) current induced in the loop (as seen from the left).

B, B (decreases, a clockwise)

Explanation:

Finally, the switch on the electromagnet is reopened. The magnitude of the external magnetic flux through the wire loop decreases, and there is a clockwise, current induced in the loop (as seen from the left).

none, its a machine

unlike poles attract