What is the field of force surrounding a charged particle called?

• A. Electric Field
• B. Magnetic Field
• C. Electric Potential
• D. Charge Density

Answer: (A)

The field of force around a charged particle is the electric field. This concept captures how a charge influences the space around it so that a test charge placed somewhere in that region would experience a force F = qE, where q is the test charge. The magnitude of the field is E = F/q, and its direction is the direction a positive test charge would move. For a single point charge, the field decreases with distance as E = (1/4πε0) q / r^2 and points radially outward for a positive charge (and inward for a negative one). This idea lets us predict forces on other charges without detailing every interaction, using E as the surrounding influence of the original charge. Magnetic fields, by contrast, relate to moving charges; electric potential is a related scalar field where E = -ΔV/Δx; and charge density describes how much charge is present per volume, not a force field.