Question

The magnetic moment of a magnet $(10cm\times 2cm\times 1cm)$ is $1A-m^2$ . The intensity of magnetisation is

• A. $6\times {10}^{4}A/m$
• B. $5\times {10}^{4}A/m$
• C. $3\times {10}^{4}A/m$
• D. $5\times {10}^{6}A/m$

Answer 1

Answer: (B)

$5\times {10}^{4}A/m$

$m=1$
$v=10\times 2\times 1$
$M=\frac{1}{10\times 2\times {10}^{-6}}$
$=5\times {10}^{4}A/m$