A short bar magnet has magnetic moment of 50 Am 2. Calculate the magnetic field intensity at a distance of 0.2 m from its centre on axial line.

Question

A short bar magnet has magnetic moment of 50 Am 2. Calculate the magnetic field intensity at a distance of 0.2 m from its centre on axial line. (A) 1.5 × 10-4 T (B) 1.25 × 10-4 T (C) 1.5 × 10-3 T (D) 1.25 × 10-3 T

Tardigrade Admin · Accepted Answer

As we know, B=(μ0 2 M/4 π r3) =(10-7 × 2 × 50/(0.2)3) =(10-7 × 100/8 × 10-3) B =1.25 × 10-3 T

Q. A short bar magnet has magnetic moment of $50 A m^{2}$ . Calculate the magnetic field intensity at a distance of $0.2 m$ from its centre on axial line.

$1.5 \times 1 0^{- 4} T$

$1.25 \times 1 0^{- 4} T$

$1.5 \times 1 0^{- 3} T$

$1.25 \times 1 0^{- 3} T$

As we know,
$B = \frac{μ _{0} 2 M}{4 π r ^{3}}$
$= \frac{1 0 ^{- 7} \times 2 \times 50}{( 0.2 ) ^{3}}$
$= \frac{1 0 ^{- 7} \times 100}{8 \times 1 0 ^{- 3}}$
$B = 1.25 \times 1 0^{- 3} T$

Q. A short bar magnet has magnetic moment of 50Am2. Calculate the magnetic field intensity at a distance of 0.2m from its centre on axial line.

1.5×10−4T

1.25×10−4T

1.5×10−3T

1.25×10−3T