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Biot–Savart law gives the magnetic field dB due to a current element I dl as
AdB ∝ I dl × r̂ / r²
BdB ∝ I² dl / r
CdB ∝ dl / I
DdB ∝ I dl · r̂
Answer & Solution
Correct answer: A. dB ∝ I dl × r̂ / r²
dB = (μ₀/4π) · I dl × r̂ / r². The direction follows the right-hand rule via the cross product.
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