Exam

JEE Main

Year

2024

Date

9 April

Shift

Evening Shift

Subject

Physics

Chapter

Magnetic Effects of Current

JEE Main 2024 · 9 April · Evening Shift · Physics · Magnetic Effects of Current

A straight magnetic strip has a magnetic moment of 44 Am^2 . If the...

A straight magnetic strip has a magnetic moment of $44 \mathrm{Am}^2$. If the strip is bent in a semicircular shape, its magnetic moment will be _______ $\mathrm{Am}^2$. (given $\pi=\frac{22}{7}$ )

Step-by-step solution

Magnetic moment of straight wire $=\mathrm{mx} \ell=44$ Magnetic moment of arc $$\begin{aligned}& =\mathrm{m} \times 2 \mathrm{r} \& =\mathrm{m} \times \frac{2 \ell}{\pi} \& =\frac{44 \times 2}{\pi}=\frac{88}{\pi}=28\end{aligned}$$