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Dipole and Magnetic Dipole Moment:
Magnetic length =
× Geometric length
= m ´ 2l
Units in SI System:
at Any Point Due to Short Magnetic Dipole:
Consider a magnetic dipole of dipole moment ().
Consider a point P at a distance 'r' from the centre of the dipole making
an angle q with the dipole axis as shown in the figure.
Derivation of Magnetic Induction ()
tanf = tanq
If P is an axial point, substitute q = 0° or q = 180° in the
\ Baxis =
for an axial point.
If P is an equatorial point, substitute q = 90° in
\ Bequator =
for an equatorial point.
Remember: Magnetic induction is a vector quantity.