A possible answer is below. There are a variety of answers.
Work Step by Step
First, the particles are extremely small compared to macroscopic systems. Because more energy is required to move more massive objects as opposed to less massive ones, a far greater amount of power would be needed to move a macroscopic system than a microscopic system in a given time interval. Furthermore, the electrostatic force is large compared to the size of the molecule, making fast oscillations possible.