1.

Magnetic intensity for an axial point due to a short bar magnet of magnetic moment M is given by [MP PET 1984; CPMT 1974; Pb. PMT 1999]

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.            \[\frac{{{\mu }_{0}}}{2\pi }\times \frac{M}{{{d}^{2}}}\]
Answer» D.            \[\frac{{{\mu }_{0}}}{2\pi }\times \frac{M}{{{d}^{2}}}\]


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