Two very long straight parallel wires carry steady currents I and –I respectively. The…

Physics · JEE Advanced · NTA ExamsMagnetic Effects of Current and Magnetism

Two very long straight parallel wires carry steady currents I and –I respectively. 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 \(\overrightarrow{\mathrm{V}}\) is perpendicular to this plane. The magnitude of the force due to the magnetic field acting on the charge at this instant is
  1. \(\frac{\mu_{0} \mathrm{Iqv}}{2 \pi \mathrm{~d}}\)
  2. \(\frac{\mu_{0} \text { Iqv }}{\pi \mathrm{d}}\)
  3. \(\frac{2 \mu_{0} \text { Iqv }}{\pi \mathrm{d}}\)
  4. zero

Answer

(D) zero

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