4. The laws of Coulomb and Biot-Savart describe how fields arise from point-like sources, that is, charge elements d? and current elements I, respectively. In fact, the laws of and Biot-Savart are related in the same way as Gauss’s and Coulomb’s laws. What should be ? (A) Faraday (B) Ampere (C) Newton (D) Lenz (E) Maxwell.