The magnetic moments associated with two closely wound circular coils A and B of radius r_A =10 cm and r_B =20 cm respectively are equal if: (Where…

The magnetic moments associated with two closely wound circular coils A and B of radius $\displaystyle \mathrm{r}_{\mathrm{A}}=10$ cm and $\displaystyle \mathrm{r}_{\mathrm{B}}=20 \mathrm{~cm}$ respectively are equal if : (Where $\displaystyle \mathrm{N}_{\mathrm{A}}, \mathrm{I}_{\mathrm{A}}$ and $\displaystyle \mathrm{N}_{\mathrm{B}}, \mathrm{I}_{\mathrm{B}}$ are number of turn and current of A and B respectively)