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Distilled water at 25ºC is characterized by σ = 1.7 × 10– 4 mho/m and ε = 78 ε0 at a frequency of 3 GHz, its loss tangent, tan δ is—
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- 1.3 × 10– 5
- 1.3 × 10– 3
- 1.7 × 10– 4/ 78 ε = 10– 9/ (36 π) F/m
- 1.7 × 10– 4/ 78 ε0
Correct Option: A
Loss tangent is given by
| tan φ = | = | ||
| ωσ | 2π × 3 × 109 × 78 × 8.6 × 10–12 |
| = | = 1.3 × 10–5 | |
| 2π × 3 × 109 × 10-9 × 78 |
