WAEC Physics 2022 Paper

Concept:The magnetic force on a current-carrying wire depends on the angle between the wire and the magnetic field.Explanation:The force is given by $F = BIL\sin\theta$, where $\theta$ is the angle between the wire and the field.When the wire is parallel to the field, $\theta = 0^\circ$, so $\sin 0^\circ = 0$.Therefore, $F = 0$, meaning the wire experiences no motor force.When the wire is perpendicular to the field, $\theta = 90^\circ$, so $\sin 90^\circ = 1$, giving the maximum force.Hence, the correct statement is that the wire experiences no motor force if it is parallel to the field.Answer:B. no motor force if it is parallel to the field.