The magnetic induction field strength due to a short bar magnet at a distance 0.20 m on the equatorial line is 20× 10- 6 T . The magnetic moment of the bar magnet is

Question

The magnetic induction field strength due to a short bar magnet at a distance 0.20 m on the equatorial line is 20× 10- 6 T . The magnetic moment of the bar magnet is (A) 3.2 A m2 (B) 6.4 A m2 (C) 1.6 A m2 (D) 16 A m2

Tardigrade Admin · Accepted Answer

B=(μ 0/4 π )(M/d3) 20× 10- 6=(10- 7 × M/8 × 10- 3) M=(1.6 × 10- 7/10- 7)=1.6 A m2

Q. The magnetic induction field strength due to a short bar magnet at a distance $0.20 m$ on the equatorial line is $20 \times 1 0^{- 6} T$ . The magnetic moment of the bar magnet is

$3.2 A m^{2}$

$6.4 A m^{2}$

$1.6 A m^{2}$

$16 A m^{2}$

$B = \frac{μ _{0}}{4 π} \frac{M}{d ^{3}}$
$20 \times 1 0^{- 6} = \frac{1 0 ^{- 7} \times M}{8 \times 1 0 ^{- 3}}$
$M = \frac{1.6 \times 1 0 ^{- 7}}{1 0 ^{- 7}} = 1.6 A m^{2}$

Q. The magnetic induction field strength due to a short bar magnet at a distance 0.20m on the equatorial line is 20×10−6T . The magnetic moment of the bar magnet is

3.2Am2

6.4Am2

1.6Am2

16Am2