Question Detail

The force (F) on a charged particle in an electric field (E) is given by F = qE, and in a magnetic field (B) it's F = qvB sinθ. From these formulas:I. The force directly depends on the charge (q) on the body. (True)II. The force directly depends on the strength of the electric field (E) or magnetic field (B). (True)III. The distance between the body and a test charge is relevant for calculating the field created by a source charge (e.g., Coulomb's Law F=kq1q2/r^2 for force between two charges, or E=kq/r^2 for electric field from a point charge). However, once the field (E or B) is established, the force on a given charged particle (the 'body' in the question) in that field depends on its charge and the field strength, not on the distance to another test charge or the source charge that created the field, if the field itself is already known. So, this factor is not directly applicable in the general sense of the force on a charged particle in a given field. (False in this general context).Therefore, only I and II are correct.