alleryBiot Savart law gives magnetic field due to a current element. It states dB is proportional to:
AI dl × r / r³
BI × r
Cdl / r²
DI × dl
Answer & Solution
Correct answer: A. I dl × r / r³
We have dB = (μ₀ / 4π) × (I dl × r̂ / r²).
So dB = (μ₀ / 4π) × (I dl × r / r³).
Direction by right-hand rule (cross product of dl and r).
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