Which of the following statements about a straight current-carrying wire placed in a uniform magnetic field is correct? The wire experiences
maximum motor force if the current reverses its direction
no motor force if it is parallel to the field
n o motor force if it is perpendicular to the fiel
D. a motor force with constant direction if either the current or the magnetic field is reversed
Step-by-Step Explanation
A straight current-carrying wire experiences a motor force due to the interaction between the magnetic field and the electric current flowing through it. When the wire is parallel to the magnetic field lines, there is no angle between the current and the field, resulting in zero motor force. This principle is described by the Lorentz force law, which states that the force is maximized when the wire is perpendicular to the magnetic field.