In the Biot-Savart Law, the Normal of the Plane That

Multiple Choice

In the Biot-Savart Law, the normal of the plane that is formed by the current vector and the r (position) vector is

A) parallel with the magnetic field vector at r.
B) perpendicular to the magnetic field vector at r.
C) skewed to the magnetic field vector at r.
D) both (b) and (c) are correct.