Lesson_3.1_Homework

# Lesson_3.1_Homework - with a plate separation of 1.0 cm(i...

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Lesson 3.1 Homework 1. A 15-pF capacitor has a potential difference of 1.50 V between its plates. What is the magnitude of charge on each plate? 2. An air parallel plate capacitor consists of two circular discs of radius R separated by a distance R/1000. By what factor does the capacitance change if R is doubled? 3. An electric field of 2.8 × 10 5 V.m -1 exists between two parallel plates each of area 21.0 cm 2 and separated by 0.25 cm of air. What is the charge on each plate? 4. How strong is the electric field between the plates of an 0.80- μ F air gap capacitor if they are 2.0 mm apart and has a charge of 72 μ C? 5. A large metal sheet of thickness l is placed between and parallel to the plates of a parallel plate capacitor. If it does not touch the plates, (i) what is the net capacitance of the capacitor? (ii) If l = (2/3)d, by what factor does the capacitance change when the sheet is inserted? 6. Consider an air parallel plate capacitor with a capacitance of 1.0 F

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Unformatted text preview: with a plate separation of 1.0 cm. (i) If the plates are square, what is the length of the side of the square? (ii) If the plates are circular, what is its radius? 7. Find the energy stored in a 20-pF capacitor when it is charged to 5 C. How much additional energy is required to charge it from 5 to 10 C? 8. An electric field 2 10 4 V exists between the plates of a circular parallel plate capacitor of plate separation 2 mm. (i) What is the voltage across the capacitor? (ii) What is the radius of the plate if the charge on it is 10 c? 9. (i) A 3.0- F capacitor is charged to 100 V. What is the energy of this charged capacitor? (ii) How much additional energy is required to charge the capacitor from 100 to 200 V? 10. What is the capacitance of a pair of circular plates of radius 5.0 cm separated by 3.2 mm mica?...
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Lesson_3.1_Homework - with a plate separation of 1.0 cm(i...

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