Question

Write an expression of Biot-Savart law in vector form.

Answer 1

`d vec B = (μ_o I)/(4 pi) (vec(dl) xx hatr)/r^2`

Where:

• `d vec B` = magnetic field due to the current element
• μ₀ = permeability of free space
• I = current
• `d vec l` = current element
• `hatr` = unit vector from the current element to the point
• r = distance between the current element and the point