Final answer:
Applying Fleming's left-hand rule, with the magnetic field pointing north and the current going south, the west edge of the coil will rise up due to the magnetic force.
Step-by-step explanation:
To determine which edge of the coil will rise up when the wire oriented north-south carries current south and is immersed in the Earth's magnetic field, we use Fleming's left-hand rule for motors. The thumb represents the motion of the conductor (which, in this case, will be the direction of the force experienced by the wire), the first finger represents the direction of the magnetic field, and the second finger represents the direction of the current. Since the current is flowing south and the magnetic field has a horizontal component pointing north, the left hand positioned with the first finger pointing north (magnetic field) and the second finger pointing south (current), would result in the thumb pointing towards the west. Thus, it is the west edge of the coil that will rise up.