2) in the vector form Table 5 1 summarises
the analogy between electric and magnetic dipoles Electrostatics
Magnetism
1/e0
m0
Dipole moment
p
m
Equatorial Field for a short dipole
–p/4pe0r 3
– m0 m / 4p r 3
Axial Field for a short dipole
2p/4pe0r 3
m0 2m / 4p r 3
External Field: torque
p × E
m × B
External Field: Energy
–p