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):
- A8π×10⁻⁶ TCorrect
- B4π×10⁻⁶ T
- C8π×10⁻⁵ T
- D2π×10⁻⁶ T
Correct answer
8π×10⁻⁶ T
Explanation
B = μ₀I/(2R) = 4π×10⁻⁷ × 4/(2 × 0.1) = 8π×10⁻⁶ T.