Magnetic Effects Of Current And Magnetism

Step 1: Direction of magnetic field and current.
The current carrying loop lies in the x–y plane and the magnetic field is directed along the z-axis. The current in the loop is clockwise. According to the right-hand rule, the magnetic forces acting on different segments of the loop must be analyzed using the Lorentz force law.
Step 2: Magnetic force on a current element.
The force on a current carrying conductor in a magnetic field is given by where is the current, is the length vector in the direction of current, and is the magnetic field.
Step 3: Direction of forces on the loop segments.
Each segment of the loop experiences a force due to the magnetic field. Because the magnetic field is perpendicular to the plane of the loop, the forces on all the sides of the loop act radially outward. This happens due to the cross product . Thus every small segment of the loop experiences a force directed away from the center.
Step 4: Resulting effect on the loop.
Since the forces on all parts of the loop are directed outward, the loop experiences a tendency to increase its area. Therefore, the loop tends to expand rather than move along the x-axis or y-axis.
Final Answer: expand.