Fields from a Stationary Charged Mass

Steps:

• Identify sources: The ball has electric charge, producing an electric field via Coulomb's law.
• Note mass: All objects with mass generate a gravitational field, per Newton's law of universal gravitation.
• Check motion: The ball is at rest, so no velocity or current to create a magnetic field, per Ampere's law.
• Confirm: Plastic indicates an insulator, but charge presence ensures electric field; no other fields apply.

Why B is correct:

• A stationary charged object creates an electric field from charge separation (Coulomb's law) and a gravitational field from its mass (Newton's gravitation law), with no magnetic field due to rest state.

Why the others are wrong:

• A adds magnetic field, but stationary charges produce none without motion.
• C omits gravitational field, ignoring the ball's inherent mass.
• D excludes electric field, despite the explicit charge.

Final answer: B