The ink-jet printer and photocopier work on the principle of

Explanation

Ink-jet printers operate by ejecting tiny ink droplets onto paper. Many inkjet printers utilize electrostatic principles to precisely control and deflect these charged ink droplets, ensuring they land in the correct positions to form images and text. * Photocopiers (which primarily use xerography) rely heavily on electrostatic charges. The process involves uniformly charging a light-sensitive drum, selectively discharging areas when exposed to light (creating a latent electrostatic image), attracting charged toner particles to the charged areas, and then transferring the toner onto paper using further electrostatic charges.