The Biot-Savart Law describes the magnetic field which is generated by an electric current. It related the magnetic field to the magnitude, direction, length and proximity of the electric current present. The law is used in magnetostatic approximation.
The Biot-Savart law is used for calculating the resultant magnetic field B at position r which is generated by a steady current I. A continual flow of charges is constant in time; the charge neither accumulates nor depletes at any point. The equation is:
B =(u0/4π) ∫C(Idl x r/|r|^3)
- Magnetic induction current
B = uH
Was essentially a rotational analogy to the linear electric current relationship
- Electric Convection current
J = ρv
The electric current equation can be viewed as a convective current of electric charge that involved linear motion.