JEE Physics · Medium

Magnetism: Current Loop Field at Centre MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

Timer-based practiceDetailed answer reviewMobile-friendly flow
Current Loop Field at CentreMediumQuestion 20206

Question

A circular coil of radius 0.1 m carries 4 A. The field at its centre is (μ₀ = 4π×10⁻⁷):
  1. A
    8π×10⁻⁶ T
    Correct
  2. B
    4π×10⁻⁶ T
  3. C
    8π×10⁻⁵ T
  4. D
    2π×10⁻⁶ T

Correct answer

8π×10⁻⁶ T

Explanation

B = μ₀I/(2R) = 4π×10⁻⁷ × 4/(2 × 0.1) = 8π×10⁻⁶ T.