For a mica capacitor used in measurement and RF work, the dielectric loss angle δ is typically closest to which value?

Question

Solve this multiple-choice question and choose the correct option.

Accepted Answer

Introduction / Context:The loss angle δ (and dissipation factor tan δ) describe dielectric losses in capacitors. Low-loss dielectrics are preferred for precision and RF applications to minimize heating and phase error. Mica is a classic low-loss dielectric widely used in high-stability circuits. Given Data / Assumptions: Mica capacitors are low-loss with very small tan δ. We seek an order-of-magnitude choice for the loss angle in degrees. Concept / Approach:For a high-quality dielectric, tan δ is small (often 10^-3 to 10^-4 region for mica, depending on frequency and construction). A small tan δ corresponds to a small δ in radians and hence in degrees. Among the provided options, 1° best reflects a very small angle, whereas 5°, 15°, or 25° would imply unacceptably high loss for precision mica capacitors. Step-by-Step Solution: Recognize that δ is small for mica; values significantly larger than a degree would not be termed ”low-loss”.Choose the smallest practical option offered consistent with typical datasheets: ~1°. Verification / Alternative check: Industrial mica parts commonly specify dissipation factors below 0.001–0.003 at 1 kHz; converting to angles gives roughly sub-degree. Why Other Options Are Wrong: 5°, 15°, or 25° would correspond to high loss (large tan δ), not typical of mica. Common Pitfalls: Assuming all capacitor types share similar loss; electrolytics and paper types are far lossier than mica. Final Answer: 1°

For a mica capacitor used in measurement and RF work, the dielectric loss angle δ is typically closest to which value?

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