Question

In electromagnetic theory, continuity equation relates _______

(a) Volume conservation

(b) Mass conservation

(c) Charge conservation

(d) Energy conservation

The question was asked by my college professor while I was bunking the class.

Question is from Continuity Equation in section Aerodynamics – Fundamental Principles and Equations of Aerodynamics

Answer 1

Right choice is (c) Charge conservation

The best I can explain: In electromagnetic theory, charge conservation is a result of Maxwell’s equation which states that divergence of current density is equal to the negative rate of change of charge density.

∇.J=- ρ/t

Where J-current density and ρ-charge density.