When filling a container, static charge can be avoided by filling the container at the bottom.

• A. Filling the container at the bottom
• B. Filling the container at the top
• C. Filling slowly from the middle
• D. Filling rapidly

Answer: (A)

Static charge builds when materials move and rub against each other or against container surfaces, especially in dry conditions. When you fill a container by pouring from the top, the material falls through air, splashes, and repeatedly contacts and slides along the inner walls, which generates and accumulates static charges. Filling from the bottom introduces the material at the lowest point and pushes air upward in a smoother, more controlled flow, reducing turbulence and friction. With less movement and rubbing, less charge separation occurs, and any charges that do form can be easily dissipated if the system is properly grounded. The other methods tend to increase air movement and collisions, leading to more static buildup.