Question

The magnetic moment has dimensions of:

• A. $[LA]$
• B. $[L^2A]$
• C. $[LT^{-1}A]$
• D. $[L^2T^{-1}A]$

Answer 1

Answer: (B)

$[L^2A]$

Answer 2

Magnetic moment of a current carrying coil is defined as the product of current in the coil with the area of coil in vector form. That is, $\vec{ M }=I \vec{ A }$ Thus, dimensions of $M=[ A ]\left[ L ^{2}\right]$ $=[L^2A]$