The Force on a Current-Carrying Wire in a Magnetic Field

Multiple Choice

The force on a current-carrying wire in a magnetic field is equal to zero when

A) the current is parallel to the field lines.
B) the current is at a 30° angle with respect to the field lines.
C) the current is at a 45° angle with respect to the field lines.
D) the current is at a 60° angle with respect to the field lines.
E) the current is perpendicular to the field lines.