Question

Is integral is usually around a closed curve?

(a) True

(b) False

The question was posed to me during an interview.

My doubt stems from The Vortex Filament, Biot-Savart Law, Helmholtz Theorem topic in section Flow over Airfoils over Finite Wing of Aerodynamics

Answer 1

Correct answer is (a) True

The explanation is: The integral is usually around a closed curve since stationary electric currents can only flow around closed paths when they are bounded. However, the law also applies to infinitely long wires as used in the definition of the SI unit of electric current.