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One example of omnidirectional antennas is the very common vertical antenna or whip antenna consisting of a metal rod (often, but not always, a quarter of a wavelength long). A dipole antenna is similar but consists of two such conductors extending in opposite directions, with a total length that is often, but not always, a half of a wavelength long. Dipoles are typically oriented horizontally in which case they are weakly directional: signals are reasonably well radiated toward or received from all directions with the exception of the direction along the conductor itself; this region is called the antenna blind cone or null.

What type of antenna would most likely be a half a wavelength long?
Answer: dipole
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Several solid dielectrics are available, including paper, plastic, glass, mica and ceramic materials. Paper was used extensively in older devices and offers relatively high voltage performance. However, it is susceptible to water absorption, and has been largely replaced by plastic film capacitors. Plastics offer better stability and ageing performance, which makes them useful in timer circuits, although they may be limited to low operating temperatures and frequencies. Ceramic capacitors are generally small, cheap and useful for high frequency applications, although their capacitance varies strongly with voltage and they age poorly. They are broadly categorized as class 1 dielectrics, which have predictable variation of capacitance with temperature or class 2 dielectrics, which can operate at higher voltage. Glass and mica capacitors are extremely reliable, stable and tolerant to high temperatures and voltages, but are too expensive for most mainstream applications. Electrolytic capacitors and supercapacitors are used to store small and larger amounts of energy, respectively, ceramic capacitors are often used in resonators, and parasitic capacitance occurs in circuits wherever the simple conductor-insulator-conductor structure is formed unintentionally by the configuration of the circuit layout.

What sort of circuit are plastic capacitors especially useful for?
Answer: timer circuits
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The Directorate of Analysis produces all-source intelligence investigation on key foreign and intercontinental issues relating to powerful and sometimes anti-government sensitive topics. It has four regional analytic groups, six groups for transnational issues, and three focus on policy, collection, and staff support. There is an office dedicated to Iraq, and regional analytical Offices covering the Near Eastern and South Asian Analysis, the Office of Russian and European Analysis, and the Office of Asian Pacific, Asian Pacific, Latin American, and African Analysis and African Analysis.

The Directorate of Analysis has an office dedicated to what country?
Answer:
Iraq