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(b) A simple parallel-plate capacitor is to be made to store charge at a potential of 7000 V. The capacitor has the separation distance between

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(b) A simple parallel-plate capacitor is to be made to store charge at a potential of 7000 V. The capacitor has the separation distance between plates of 0.21 mm and the area of the plates is 0.020 m. A material having dielectric constant of 5.0 is positioned between the plates. (Kapasitor plat selari ringkas akan dibina untuk menyimpan cas pada potensi 7000 V. Kapasitor ini mempunyai jarak pemisahan antara plat 0.21 mm dan luas plat ialah 0.020 m. Satu bahan yang mempunyai pemalar dielektrik sebanyak 5.0 diletakkan di antara plat.) (i) Compute the capacitance of the capacitor. [Hitungkan kemuatan bagi kapasitor.] (3 Marks/ Markah) (ii) Compute the magnitude of the charge stored on each plate. (Tentukan magnitud cas yang disimpan pada setiap plat.) (2 Marks/ Markah) ....3/- SULIT SULIT (EMJ 26603) - 3 - (iii) If the capacitance in (i) need to be increased, suggest one suitable dielectric material between plates from listed materials in Table 2. Justify your choice in calculation. [Jika kemuatan dalam (i) perlu dinaikkan, cadangkan satu bahan dielektrik yang sesuai antara plar daripada bahan-bahan yang tersenarai dalam Jadual 2. Justifikasikan pilihan anda dalam pengiraan./ (4 Marks/ Markah) Table 2 [Jadual 21 Dielectric Materials Aluminium Oxide Mica Porcelain Fused Silica Polypropylene PP Dielectric Constant 8.2 7.2 6.0 3.8 2.2

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