Which of the following is a use of static electricity?

• A. Ink jets, printers, photocopiers and spray paint
• B. Batteries in devices
• C. Magnetic storage
• D. Heating elements

Answer: (A)

Static electricity lets charged particles be directed to where you want them to land. In printing and coating processes, giving ink or paint a charge means an electric field can pull or steer those droplets toward the exact spot on the surface, which makes printing sharper and spray painting more efficient. This principle is used in ink-jet printers and photocopiers, where toner or ink is controlled by electrostatic forces, and in spray painting, where charged droplets are attracted to the object being coated, reducing waste and improving coverage. Other options rely on different principles: batteries store energy chemically, magnetic storage uses magnetism, and heating elements convert electrical energy into heat, none of which depend on static electricity to deposit material.