For 10 points, name this field denoted by a capital B, the counterpart of the electric field.
A beam of light interacting with one of these entities has its plane of polarization rotated in an effect named after Faraday. The strength of this entity produced by a steady current can be calculated using the Biot–Savart Law. This quantity is crossed with velocity to find the (*) Lorentz force, and the electric field divided by the permeability of free space crossed with this quantity is the Poynting vector. A current flowing perpendicular to one of these results in a voltage difference in the Hall effect. For 10 points, name this field denoted by a capital B, the counterpart of the electric field.
A beam of light interacting with one of these entities has its plane of polarization rotated in an effect named after Faraday.
magnetic field [prompt on “B field”] &lt;SR Physics&gt;