A 100 turn closely wound circular coil of radius 10 cm carries a current of 3.2 A . The magnetic moment of the coil is, approximately

Question

A 100 turn closely wound circular coil of radius 10 cm carries a current of 3.2 A . The magnetic moment of the coil is, approximately (A)  5 A m2  (B)  10 A m2  (C)  20 A m2  (D)  40 A m2

Tardigrade Admin · Accepted Answer

Magnetic moment, M=niA M=100× 3.2× (π r12) =100× 3.2× (22/7)× (10/100)× (10/100) =10.048 A-m2

Q. A $100$ turn closely wound circular coil of radius $10 c m$ carries a current of $3.2 A$ . The magnetic moment of the coil is, approximately

$5 A m^{2}$

$10 A m^{2}$

$20 A m^{2}$

$40 A m^{2}$

Magnetic moment,
$M = ni A$
$M = 100 \times 3.2 \times (π r_{1}^{2})$
$= 100 \times 3.2 \times \frac{22}{7} \times \frac{10}{100} \times \frac{10}{100}$
$= 10.048 A - m^{2}$

Q. A 100 turn closely wound circular coil of radius 10cm carries a current of 3.2A . The magnetic moment of the coil is, approximately

5Am2

10Am2

20Am2

40Am2