An element d = dx i (where dx = 1 cm) is placed at the origin and carries a large current…

Physics · JEE Main · NTA Exams — Magnetic Effects of Current and Magnetism

An element \(\mathrm{d} \vec{\ell}=\mathrm{dx} \hat{\mathrm{i}}\) (where dx = 1 cm) is placed at the origin and carries a large current I = 10A. What is the magnetic field on the y-axis at a distance of 0.5 m ?
  1. \(2 \times 10^{-8} \hat{\mathrm{k}} \mathrm{~T}\)
  2. \(4 \times 10^{-8} \hat{\mathrm{k}} \mathrm{~T}\)
  3. \(-2 \times 10^{-8} \hat{\mathrm{k}} \mathrm{~T}\)
  4. \(-4 \times 10^{-8} \hat{\mathrm{k}} \mathrm{~T}\)

Answer

(B) 4 10^ -8 k ~T

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