When a bar magnet approaches a coil: the flux through the coil increases (if the N-pole approaches). By Lenz's law, the induced current creates a field opposing the increase — so the coil's near face becomes a N-pole (repelling the magnet). The induced current flows counterclockwise when viewed from the magnet's side. When the magnet recedes: the flux decreases, the coil's near face becomes S-pole (attracting, opposing the separation). Force required to push the magnet in = mechanical energy converted to electrical energy.