Question

Which equation will hold good for a magnetic material?

(a) Line integral of H is zero

(b) Surface integral of H is zero

(c) Line integral of B is zero

(d) Surface integral of B is zero

I had been asked this question during an interview.

Question is taken from Maxwell Law 4 topic in division Maxwell Equations of Electromagnetic Theory

Answer 1

The correct answer is (d) Surface integral of B is zero

For explanation I would say: We know that the divergence of B is zero. From Stokes theorem, the surface integral of B is equal to the volume integral of divergence of B. Thus surface integral of B is also zero.