Question

Current $i$ is flowing in a coil of area $A\&$ number of turns $N,$ then magnetic moment of the coil is $M$ is equal to

• A. $NiA$
• B. $\frac{Ni}{A}$
• C. $\frac{Ni}{\sqrt{A}}$
• D. $N^{2}Ai$

Answer 1

Answer: (A)

$NiA$

Magnetic moment is given by $M=NI\overrightarrow{A}$,

where $\overrightarrow{A}$ is perpendicular to the area and has magnitude of the area.