This
follows from the Lorentz force formula Thus, it is logical
to expect that two current-carrying conductors placed near
each other will exert (magnetic) forces on each other In
the period 1820-25, Ampere studied the nature of this
magnetic force and its dependence on the magnitude of
the current, on the shape and size of the conductors, as
well as, the distances between the conductors In this
section, we shall take the simple example of two parallel
current- carrying conductors, which will perhaps help us
to appreciate Ampere’s painstaking work