NDA General Ability Question (2025) — Solution

Step-by-step solution

Under static conditions, an insulator can be charged by methods such as friction or contact. The charge supplied to an insulator remains localized at the region of application because charges cannot move freely within the material. A perfect conductor can also be charged. When a net charge is given to an isolated conductor, it redistributes itself entirely over its outer surface to maintain a zero electric field inside the material, which is a requirement for electrostatic equilibrium. Therefore, both a perfect conductor and an insulator can be charged and hold a static charge. Answer : Both perfect conductor and insulator can be charged