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Magnetism and Matter — Physics STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 SciencePhysicsMagnetism and Matter1 Mark
Question
Write an expression for intensity of magnetisation field at a point located at a distance $r$ on its axis due to a small bar magnet having magnetic moment $\overrightarrow{ m }$.
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Answer

$\vec{B}=\frac{\mu_0}{4 \pi} \times \frac{2 \vec{m}}{r^3}$

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