Question

A circular coil of one turn and area $A$ carrying a current has a magnetic dipole moment $M$. The current through the coil is :

• A. $MA$
• B. $\frac{A}{M}$
• C. $\frac{M}{A}$
• D. $\frac{M}{A^2}$

Answer 1

The correct option is C $\frac{M}{A}$

Magnetic moment of the circular current carrying coil,
$M=NiA$

$i=\frac{M}{NA}$

$=\frac{M}{1\times A}$

$=\frac{M}{A}$