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1) A parallel-plate capacitor with dimensions of 38 mm by 65 mm and a plate separation of 1.3 mm must have a minimum capacitance of 7 × 101" F when an ac potential of 1000 V is applied at a frequency of 1 MHz. Which of the materials listed below are possible candidates? Why? Dielectric Constant I MHz Dielectric Strength (V/mil)" Material 60 Hz Ceramics Titanate ceramics Mica Steatite (MgO-SiO,) Soda-lime glass 15-10,000 5.4-8.7 50–300 1000–2000 200–350 250 5.5–7.5 6.9 6.9 Porcelain 6.0 6.0 40–400 Fused silica 4.0 3.8 250 Polymers Phenol-formaldehyde Nylon 6,6 Polystyrene Polyethylene Polytetrafluoroethylene *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. 5.3 300–400 4.8 3.6 4.0 400 2.6 2.6 500-700 2.3 2.3 450-500 2.1 2.1 400–500

1) A parallel-plate capacitor with dimensions of 38 mm by 65 mm and a plate separation of 1.3 mm must have a minimum capacitance of 7 × 101" F when an ac potential of 1000 V is applied at a frequency of 1 MHz. Which of the materials listed below are possible candidates? Why? Dielectric Constant I MHz Dielectric Strength (V/mil)" Material 60 Hz Ceramics Titanate ceramics Mica Steatite (MgO-SiO,) Soda-lime glass 15-10,000 5.4-8.7 50–300 1000–2000 200–350 250 5.5–7.5 6.9 6.9 Porcelain 6.0 6.0 40–400 Fused silica 4.0 3.8 250 Polymers Phenol-formaldehyde Nylon 6,6 Polystyrene Polyethylene Polytetrafluoroethylene *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. 5.3 300–400 4.8 3.6 4.0 400 2.6 2.6 500-700 2.3 2.3 450-500 2.1 2.1 400–500

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1) A parallel-plate capacitor with dimensions of 38 mm by 65 mm and a plate separation of 1.3 mm must have a minimum capacitance of 7 x 10" F when an ac potential of 1000 V is applied at a frequency of 1 MHz. Which of the materials listed below are possible candidates? Why? Dielectric Constant I MHz Dielectric Strength (V/mil)" Material 60 Hz Ceramics Titanate ceramics Mica 15–10,000 50-300 5.4-8.7 Steatite (MgO-SiO;) Soda-lime glass Porcelain 1000-2000 200–350 250 5.5-7.5 6.9 6.9 40–400 250 6.0 6.0 Fused silica 4.0 3.8 Polymers Phenol-formaldehyde Nylon 6,6 Polystyrene Polyethylene Polytetrafluorocthylene " One mil = 0.001 in. These values of dielectrie 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. 5.3 4.8 300–400 4.0 3.6 2.6 400 2.6 500–700 2.3 2.3 450–500 2.1 2.1 400–500
Transcribed Image Text:1) A parallel-plate capacitor with dimensions of 38 mm by 65 mm and a plate separation of 1.3 mm must have a minimum capacitance of 7 x 10" F when an ac potential of 1000 V is applied at a frequency of 1 MHz. Which of the materials listed below are possible candidates? Why? Dielectric Constant I MHz Dielectric Strength (V/mil)" Material 60 Hz Ceramics Titanate ceramics Mica 15–10,000 50-300 5.4-8.7 Steatite (MgO-SiO;) Soda-lime glass Porcelain 1000-2000 200–350 250 5.5-7.5 6.9 6.9 40–400 250 6.0 6.0 Fused silica 4.0 3.8 Polymers Phenol-formaldehyde Nylon 6,6 Polystyrene Polyethylene Polytetrafluorocthylene " One mil = 0.001 in. These values of dielectrie 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. 5.3 4.8 300–400 4.0 3.6 2.6 400 2.6 500–700 2.3 2.3 450–500 2.1 2.1 400–500
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