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5.Magnetism and Matter
easy
Magnetic intensity for an axial point due to a short bar magnet of magnetic moment $M$ is given by
A
$\frac{{{\mu _0}}}{{4\pi }} \times \frac{M}{{{d^3}}}$
B
$\frac{{{\mu _0}}}{{4\pi }} \times \frac{M}{{{d^2}}}$
C
$\frac{{{\mu _0}}}{{2\pi }} \times \frac{M}{{{d^3}}}$
D
$\frac{{{\mu _0}}}{{2\pi }} \times \frac{M}{{{d^2}}}$
Solution
(c)${B_a} = \frac{{{\mu _0}}}{{4\pi }}\frac{{2M}}{{{d^3}}} = \frac{{{\mu _0}}}{{2\pi }}\frac{M}{{{d^3}}}$
Standard 12
Physics
