Discussion
The SI unit of magnetic dipole moment is ........ .
Answer: D
The SI unit is C m\(^{2}\)/s.
The magnetic dipole moment of a current loop is \(m = IA\), current times area, so its unit is the ampere square metre. Since one ampere is one coulomb per second:
\[ \begin{aligned} \text{A m}^{2} &= \frac{\text{C}}{\text{s}}\,\text{m}^{2} \\ &= \text{C m}^{2}/\text{s} \end{aligned} \]
The coulomb metre (C m) is the unit of the electric dipole moment, a common confusion. C m\(^{2}\) and C m/s lack the correct combination of area and time.
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