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Permittivity and conductivity are insensitive to ______ for a good conductor.

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Permittivity and conductivity are insensitive to ______ for a good conductor.

(a) Operating frequency

(b) Polarization density

(c) Electric field

(d) Property of material

This question was posed to me in an internship interview.

The doubt is from Reflection topic in chapter Mobile Radio Propagation: Large – Scale Path Loss of Wireless/Mobile

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The correct answer is (a) Operating frequency

The explanation is: The terms permittivity and conductivity are insensitive to operating frequency when the material is a good conductor. In the case of conductors, it is evident that electric field inside a conductor is zero. That is because free charges reside only on the surface of conductor and not inside.

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