Final answer:
The statement that magnetic disks use magnetic particles to store items on the disk's surface is true. Magnetic disks align magnetic particles to represent binary data which can be read to retrieve stored information. The correct option is a. true
Step-by-step explanation:
Magnetic disks use magnetic particles to store data on the disk's surface. This statement is true. Magnetic storage media, such as hard drives, use a magnetizable material coated on the disk's surface.
When information is written to the disk, magnetic fields are used to align regions or particles on the disk's surface to represent binary data (1s and 0s). These magnetic orientations can then be read by the disk drive to retrieve the stored information.
It's important not to expose magnetic storage media to strong external magnetic fields. For example, credit cards with magnetic strips should not be placed near permanent magnets, as this can demagnetize the strips and erase the information stored on them.
Similarly, other interesting phenomena related to magnetism and electricity include the induction of an electric current if a bar magnet is dropped through a copper tube, as well as the concept that each fragment of a shattered magnet will still have a north and a south pole. The correct option is a. true