A current I = 15 A is directed along the positive x-axis
and perpendicular to a magnetic field. A magnetic force
per unit length of 0.12 N/m acts on the conductor in the
negative y -direction. Calculate the magnitude and direction
of the magnetic field in the region through which
the current passes.

Question

A current I = 15 A is directed along the positive x-axis
and perpendicular to a magnetic field. A magnetic force
per unit length of 0.12 N/m acts on the conductor in the
negative y -direction. Calculate the magnitude and direction
of the magnetic field in the region through which
the current passes.

anonymous · Answer

equation for magnetic force on some conductor
$$F=BIL$$
you have I, F/L, find B

shamim · Answer

The actual formula is
F=il*B
Here l and B are vectors