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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
