A magnetic field may be generated by

Step-by-step solution

According to the Ampere-Maxwell law, the line integral of the magnetic field around a closed loop is proportional to the sum of the conduction current and the displacement current passing through the surface bounded by the loop. The equation is given by B d l = ₀ I_c + ₀ ₀ d _E dt Here, I_c represents the conduction current which is due to moving charges, and ₀ d _E dt represents the displacement current which is due to a changing electric field. Thus, a magnetic field can be generated by both a moving charge and a