As shown above, three infinitely long current-carrying wires
L
,
M
and
N
are fixed on the
-plane, all parallel to the
-axis. The distances from the
-axis are
,
and
, respectively. The intensities of the currents flowing in the wires
L
,
M
and
N
are
,
and
, respectively. The direction of the electric current in
L
is
direction and the directions of the electric currents in
M
and
N
are both
direction. Let
and
denote the sum of the magnetic forces acting on each of the segments (of the same length) of
and
respectively. Then what is the ratio
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