Question

The magnetic moment of a magnet of length 10 cm and pole strength 4.0 Am will be

• A. $0.4A{m}^2$
• B. $1.6A{m}^2$
• C. $20A{m}^2$
• D. $8.0A{m}^2$

Answer 1

The correct option is A $0.4A{m}^2$

$M=mL=4\times 10\times {10}^{-2}=0.4A\times m^2$