Question

The SI unit of magnetic moment is
(A) Am
(B) Nm rad-1
(C) Tm A-1
(D)JT-1
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Answer 1

SI UNIT of Magnetic Moment:

• Magnetic moment is a vector quantity and calculated as the product of current and area of cross-section.

• It is denoted as M.

• M = I × area

So, its SI UNIT should be :

$= ampere \times {m}^{2}$

• However , magnetic moment can also be written as : M = Torque/Field Intensity.

In that case ,SI unit will be :

$= N \: m \: {T}^{ - 1}$

• 'N' : Newton , 'T' is Tesla.

$= J\: {T}^{ - 1}$

• Nm can be written as Joule (J).

Option D) is correct ✔️