What is reflection of light
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The force is greatest when the wire is perpendicular to the magnetic field.
In fact, the expression for the magnetic force is
where I is the current, L the length of the wire, B the magnetic field intensity and
is the angle between the directions of I and B.
We can see that F is maximum when
, so when 
, so when the wire and the magnetic field are perpendicular to each other.
In fact, the expression for the magnetic force is
where I is the current, L the length of the wire, B the magnetic field intensity and
We can see that F is maximum when