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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 zeroI had been asked this question during an interview.Question is taken from Maxwell Law 4 topic in division Maxwell Equations of Electromagnetic Theory

Answer»

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.



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