A straight magnetic strip has a magnetic moment of 44 Am 2 . If the strip is bent in a semicircular shape, its magnetic moment will be Am 2 (Given π=22/7 )

Physics · Magnetism and Matter

JEE Main 2024 — 9 April, Shift 2 — Question 46

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 $\qquad$ $\mathrm{Am}^{2}$ (Given $\pi=\frac{22}{7}$ )

Answer: 28

Numerical answer — enter this value.

Step-by-step solution

Magnetic moment of straight wire $=\mathrm{mx} \ell=44$

Magnetic moment of arc

$=\mathrm{m} \times 2 \mathrm{r}$

$=\mathrm{m} \times \frac{2 \ell}{\pi}$

$=\frac{44 \times 2}{\pi}=\frac{88}{\pi}=28$

Answer key and solution verified before publishing.

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Exam: JEE Main 2024
Paper: 9 April, Shift 2
Subject: Physics
Chapter: Magnetism and Matter
Topic: Magnetic Properties of Materials