Gujarati
5.Magnetism and Matter
easy

The magnetic field to a small magnetic dipole of magnetic moment $M$, at distance $ r$  from the centre on the equatorial line is given by (in $M.K.S. $ system)

A

$\frac{{{\mu _0}}}{{4\pi }} \times \frac{M}{{{r^2}}}$

B

$\frac{{{\mu _0}}}{{4\pi }} \times \frac{M}{{{r^3}}}$

C

$\frac{{{\mu _0}}}{{4\pi }} \times \frac{{2M}}{{{r^2}}}$

D

$\frac{{{\mu _0}}}{{4\pi }} \times \frac{{2M}}{{{r^3}}}$

Solution

(b)${B_{equatorial}} = \frac{{{\mu _0}}}{{4\pi }}\frac{M}{{{r^3}}}$

Standard 12
Physics

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