Question

For a system of unlike charges (attractive force), an external agent must do work to separate them because the system:

विकल्प

• Already has negative potential energy

• Has zero net force between the charges

• Has infinite potential energy

• Already has positive potential energy

Answer 1

Unlike charges attract, so their assembled configuration already has negative potential energy — the system is bound. An external agent must do work to separate the charges and raise the system's potential energy.