Magnetic field due to currentHard
Question
Two very long straight parallel wires carry steady state currents I and - I rexpectively. The distance between the wires is d. At a certain instant of time, a point charge q is at a point equidistant from two wires in the plane of the wires. Its instantaneous velocity 
is perpendicular to this plane. The magnitude of the force due to magnetic field acting on the charge at this instant is
is perpendicular to this plane. The magnitude of the force due to magnetic field acting on the charge at this instant is Options
A.
B.
C.
D.zero
Solution
Net magnetic field due to both the wires will be downwards as shown in the figure
Since, angle between
and 
is 180oTherefore, magnetic force
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