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Olympiad workbookNSEPMagnetic Effects of Current

An infinitely long straight non-magnetic conducting wire of radius a carries a dc current I . The magnetic field B , at a distance r(r < a) from axis of the wire is

Options

  1. A₀ I / 2 a
  2. B₀ Ir / 2 a^2
  3. C2 ₀ I r / a^2
  4. D₀ I r^2 / 2 a^3

Correct answer

B. ₀ Ir / 2 a^2

Step-by-step solution

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