alleryThe magnetic field at the centre of a circular loop of radius R carrying current I is
AB = μ₀ I R²
BB = μ₀ I / (2 R)
CB = μ₀ I / (4π R)
DB = μ₀ I R / 2
Answer & Solution
Correct answer: B. B = μ₀ I / (2 R)
Special case of Biot–Savart for a full circular loop: at the centre, B = μ₀I/(2R), directed along the axis.
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