Question

A thin straight strip of length 5cm and magnetic moment 0.5 Am${}^2$ was bent such that there is a gap of 1 cm at its ends. Then the magnetic moment of this will be (nearly)

• A. 0.1 Am${}^2$
• B. 0.2 Am${}^2$
• C. 0.05 Am${}^2$
• D. 0.25 Am${}^2$

Answer 1

Answer: (A)

0.1 Am${}^2$

$L_1=5cm$
$L_2=1cm$
${\mu }_1=0.5$
$\frac{{\mu }_1}{L_1}=\frac{{\mu }_2}{L_2}$
$\frac{0.5}{5}=\frac{{\mu }_2}{1}$
${\mu }_2=0.1A{m}^2$