When an ac potential of 1000 V is applied at a frequency of 1 MHz, a parallel-plate capacitor with dimensions of 38 mm by 65 mm and a plate spacing of 1.3 mm must have a minimum capacitance of 70 pF. Which of the materials listed in Table 2 might be a good fit? Why?
When an ac potential of 1000 V is applied at a frequency of 1 MHz, a parallel-plate capacitor with dimensions of 38 mm by 65 mm and a plate spacing of 1.3 mm must have a minimum capacitance of 70 pF. Which of the materials listed in Table 2 might be a good fit? Why?
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ISBN:9780133923605
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When an ac potential of 1000 V is applied at a frequency of 1 MHz, a parallel-plate capacitor with dimensions of 38 mm by 65 mm and a plate spacing of 1.3 mm must have a minimum capacitance of 70 pF. Which of the materials listed in Table 2 might be a good fit? Why?
Transcribed Image Text:Table 2: Dielectric Constants and Strengths for Some Dielectric Materials
Dielectric Constant
I MH:
Dielectric Strength
(V/mil)"
Material
60 H:
Ceramics
Titanate ceramics
15-10,000
5.4-8.7
50-300
1000-2000
Mica
Steatite (MgO-Sio,)
Soda-lime glass
Porcelain
5.5-7.5
200-350
6.9
6.0
6.9
6.0
250
40-400
Fused silica
4.0
3.8
250
Polymers
Phenol-formaldehyde
Nylon 6,6
Polystyrene
Polyethylene
Polytetrafluoroethylene
5.3
4.0
4.8
3.6
300-400
400
2.6
2.6
500-700
450-500
400-500
2.3
2.3
2.1
2.1
"One mil = 0.001 in. These values of dielectric strength are average ones, the magni-
tude being dependent on specimen thickness and geometry, as well as the rate of
application and duration of the applied electric field.
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