Copper behaves as a :
Conductor or dielectric depending on the frequency
Conductor or dielectric depending on the frequency option is correct.
Whether a medium behaves as a good conductor or a good dielectric is decided by the loss tangent \(\tan\delta = \sigma/(\omega\varepsilon)\). When \(\sigma \gg \omega\varepsilon\) the material is a conductor; when \(\sigma \ll \omega\varepsilon\) it acts as a dielectric.
Copper has a very large but finite conductivity. At normal radio and microwave frequencies \(\sigma/\omega\varepsilon\) is enormous and copper is an excellent conductor, but at optical and higher frequencies \(\omega\varepsilon\) becomes comparable to or larger than \(\sigma\) and copper starts to exhibit dielectric-like behaviour. Field strength and current density do not appear in the loss-tangent criterion, so those distractors are wrong.
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Important Questions from Mixed Topic (MH-SET)
.................... is a client server application that identifies each host on the internet with a unique user-friendly name.
Every OS has a ................ or .......... which primarily resides in the main memory of the computer to perform some of the basic functions of the OS.
(i) Kernel
(ii) Interface
(iii) Nucleus
(iv) Compiler
Codes:
Which of the following are referred to as low level language?
(i) Machine language
(ii) Assembly language
(iii) High level language
(iv) Natural language
Codes:
Match the following:
List I List II (a) New York Public Library (i) Shelv AR (b) Miami University Augmented Research Group (ii) Smart library (c) Oula University Library (iii) Wolf Walk (d) North Carolina State University (iv) Find the future Codes:
Which part of the QR code represents the encoded data?
