Consider the following equations (B is a magnetic field, J is current density, μ₀ is permeability constant):
∇·B = 0 (1)
∇×B = 0 (2)
∇·B = μ₀J (3)
∇×B = μ₀J (4)
a. Equations (1) and (4) are the Maxwell’s equations for magnetostatics.
b. Equations (2) and (3) are the Maxwell’s equations for magnetostatics.
c. The Ampère’s law can be derived from (4).
d. The Ampère’s law can be derived from (3).