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  4. A wire of length 314 cm carrying current of 14 A is bent to form a circle. The magnetic moment of the coil is A- m 2. [Given π=3.14]

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Q. A wire of length $314 \,cm$ carrying current of $14 A$ is bent to form a circle. The magnetic moment of the coil is ____A- $m ^2$. [Given $\pi=3.14]$

JEE MainJEE Main 2022Magnetism and Matter

Solution:

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$ \frac{314}{100}=2 \pi R R =0.5 \,m$
Magnetic Moment $= IA $
$=14 \times \pi R ^2 $
$=14 \times(3.14) \times \frac{1}{4} $
$=10.99 \approx 11.00$