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Two very long straight parallel wires carry steady currents i and 2i in opposite directions. The
distance between the wires is d. At a certain instant of time a point charge q is at a point
equidistant from the two wires in the plane of the wires. Its instantaneous velocity \(\overrightarrow{v}\)
is perpendicular to this plane. The magnitude of the force due to the magnetic field acting on the charge at this instant is :
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