A current loop of area $A$ carrying current $I$ has a MAGNETIC MOMENT of magnitude

1. syllabus defines the magnetic moment as $\vec{m} = I\,\vec{A}$. 2. The vector $\vec{A}$ has magnitude equal to the LOOP AREA, and direction along the loop's normal (right-hand rule). 3. For multi-turn coils with $N$ turns: $\vec{m} = N\,I\,\vec{A}$. 4. Units of magnetic moment: $\text{A\,m}^2$, the SI unit for magnetic dipole moment. 5. The magnetic moment is analogous to the ELECTRIC dipole moment $\vec{p}$: torque in a field, energy in a field, far-field behaviour all parallel between the two. 6. Options B, C, D have wrong dimensions or wrong dependencies. _Source: syllabus Physics Part 1, Ch 4, §4.10 (Magnetic Moment of a Current Loop, Eq. 4.30), p. 21–22._