Magnetism Question 193
Question: 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)
[MP PMT/PET 1998]
Options:
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}} $
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Answer:
Correct Answer: B
Solution:
$ B _{equatorial}=\frac{{\mu _{0}}}{4\pi }\frac{M}{r^{3}} $
BETA
