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# 9 capacity.pptx

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Lecture22 capacitance
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# 9 capacity.pptx

Capacitor

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### 9 capacity.pptx

1. 1. Capacitance The amount of charge that a conductor can store when a potential difference U is applied, is a measure of its capacitance. It is experimentally found that the amount of charge increases as the potential difference increases. The coefficient of proportionality is called CAPACITANCE OF A CONDUCTOR
2. 2. Capacity The unit of capacitance is Farad ( denoted as ‘F’ )
3. 3. Capacitor A system consisting of two conductors with an insulating medium placed between them is called a capacitor. Capacitors are devices which store electric charge.
4. 4. Capacitor A is an area of the plates; d is a separation between plates; ɛo is a constant number 8.85 × 10-12 Farad/metre Excerpt From: ASTANA-KITAP. “Physics 8 EN”. Apple Books. ;
5. 5. Example A parallel plate capacitor of capacitance 4 µF, carries a charge of 60 µC. What is the potential difference between the plates of the capacitor?
6. 6. Example A parallel plate capacitor has an area of 40 cm x 50 cm and plate separation of 1 cm. a) What is the capacitance of this capacitor in units of Farads (F)? b) If it has a charge of 3.6 x 10–3 C, what is the potential difference across the capacitor?
7. 7. Example Find the capacitance of a parallel-plate capacitor if the area of each plate is 200 cm2 and the distance between them is 2 mm.
8. 8. Example The area of each plate of a parallel-plate capacitor is 500 cm2. What separation must the plates have in order for their capacitance to be 500 pF.
9. 9. Example A parallel-plate capacitor of plate area 200 cm2 and separation 4 mm, is connected to a voltage source of 3 kV. What is the charge on each plate?