A bar magnet is released so that it falls through a vertical solenoid, which is connected to a sensitive ammeter. An induced current flows in the solenoid, and the solenoid acts as an electromagnet. Which row states the polarity of end Y of the solenoid and the force between the solenoid and the bar magnet as the bar magnet emerges from the solenoid?
Physics 5054 · O Level · Electromagnetic induction