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b) Ceramics
Explanation: Iron and magnesium are metals. Hence they need not be considered. Both ceramics and plastic are insulators. But dielectric constant is more for ceramics always. Hence ceramics is the best dielectric.
b
Explanation: Iron and magnesium are metals. Hence they need not be considered. Both
ceramics and plastic are insulators. But dielectric constant is more for ceramics always.
Hence ceramics is the best dielectric.
A good dielectric material is one that can support electrical polarization while being an insulator, meaning it does not allow the flow of charge through it. Examples of such materials include:
– Polytetrafluoroethylene (PTFE), also known as Teflon.
– Silica (SiO2), particularly in its pure, amorphous form.
– Polyethylene, a common plastic used in a variety of applications.
– Titanium dioxide (TiO2), often used in high-index of refraction applications.
– Barium titanate (BaTiO3), known for its high permittivity.
These materials are extensively used in capacitors, cables, and other electrical insulation applications due to their high electric strength, low dielectric loss, and other desirable properties that allow them to store and sustain an electric field with minimal energy loss.