what do you mean by daulity of charges?
The electromagnetic dual concept is based on the view that in the static condition, electromagnetism has two separate aspects: electric fields and magnetic fields. Expressions of electrostatic or magnetostatic will have a directly analogous or dual expression in the other. This is because of the special relativity of the two. Thus any charge also has magnetism associated with it.
Eg:- Applying Lorentz transformation to the electric field will transform it into magnetic field.
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