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The surface integral of which parameter is zero?

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in Electromagnetic Theory by (188k points)
The surface integral of which parameter is zero?

(a) E

(b) D

(c) B

(d) H

The question was posed to me at a job interview.

This key question is from Maxwell Law in Time Varying Fields in portion Maxwell Equations of Electromagnetic Theory

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Right option is (c) B

For explanation I would say: The divergence of the magnetic flux density is always zero. By Stokes theorem, the surface integral of B is same as the volume integral of the divergence of B. Thus the surface integral of B is also zero.

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