Inducing an electric current in a single loop
Even in a single loop of wire, passing a magnet into it will create an electric current. The single loop will still have all the characteristics of how a solenoid interacts with magnets.
One single loop is still a solenoid
Follow the movement of a magnet into one loop:
A current is induced in the loop when a motion exists between the bar magnet and the loop.
When the bar magnet is stationary with respect to the loop no current is registered on the galvanometer.
The galvanometer is moved in one direction as you go towards the loop but moving it in the opposite direction....
....causes the galvanometer to also move in the opposite direction which means there is a change in current induced direction in the wire.