Practice portal › Moving Charges and Magnetism › Biot-Savart Law: Straight Wires and Arcs
Asked in GUJCET 2020 · Biot-Savart law and current element
Idea: look at what sits in the numerator of each field law.
Biot-Savart law: d⃗B=(μ₀)/(4π)(I d⃗l×̂r)/(r²) — the source is the current element I d⃗l, which points along the wire, so it is a vector.
Coulomb's law: ⃗E=1/(4πε₀)q/(r²)̂r — the source is the charge q, a scalar.
So the magnetic field has a vector source and the electric field a scalar one.
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