Final answer:
A magnetic brush is used for magnetic-sensitive powder as it helps control the toner or ink particles in applications such as photocopiers and printers.
Step-by-step explanation:
The magnetic bristle-less brush that is used for magnetic-sensitive powder is called a magnetic brush.
Magnetic brushes are used in various applications, such as in photocopiers and printers, to control the toner or ink particles. The brush is made up of a non-magnetic bristle material and is magnetized, allowing it to attract and control the magnetic powder.
For example, in a photocopier, the magnetic brush helps to transfer the toner particles from the toner container onto the photoreceptor drum, creating the desired image. The magnetization of the brush helps ensure the even distribution and controlled movement of the toner particles.