Answer:
In each of the given situations, the direction of current flow in the loop of conductor will depend on the relative motion of the magnet and the loop, as well as the orientation of the magnet.
a) In the first situation, the magnet is brought down directly above the loop, with the north pole pointing down. As the magnet is moved down, the magnetic field produced by the magnet will pass through the loop of conductor and generate a current in the loop. The direction of this current will depend on the orientation of the loop relative to the magnet. If the loop is oriented such that the current flows in a clockwise direction when viewed from above, the current will be in the clockwise direction. If the loop is oriented such that the current flows in a counterclockwise direction when viewed from above, the current will be in the counterclockwise direction.
b) In the second situation, the magnet is brought near the loop, with the north pole pointing up. The table is then raised, causing the magnet to move relative to the loop. As the magnet moves, it will generate a changing magnetic field that will induce a current in the loop. The direction of this current will depend on the orientation of the loop relative to the magnet, as well as the direction of the magnet's movement. If the loop is oriented such that the current flows in a clockwise direction when viewed from above, and the magnet is moving upward, the current will be in the clockwise direction. If the loop is oriented such that the current flows in a counterclockwise direction when viewed from above, and the magnet is moving upward, the current will be in the counterclockwise direction.
c) In the third situation, the loop of wire is rotated clockwise about its center axis. This will not produce a current in the loop, as there is no relative motion between the loop and the magnet, and therefore no changing magnetic field to induce a current. Therefore, in this situation, no current will flow in the loop.