Answer:
1. D. Each of the two segments of the original bar magnet will have a north and south pole.
2. A. Oscillator
Step-by-step explanation:
1. A magnet has two poles-north pole and south pole. Magnetic field lines exit from north pole and enter south pole. mono poles do not exist. When a bar magnet is broken into two, each segment will have a north pole and south pole. Thus, option D is correct.
2. An oscillator is used to produce periodic wave. It converts direct current into alternating current. A transmission system at a radio station uses an oscillator for converting DC into high-frequency AC.