Further, we have learnt that an external magnetic field
will exert a force on a current-carrying conductor 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