This preview shows pages 1–2. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: RECITATION 8 5. (a) The capacitance of a parallelplate capacitor is given by , C A d = where A is the area of each plate and d is the plate separation. Since the plates are circular, the plate area is A = R 2 , where R is the radius of a plate. Thus, ( 29 ( 29 2 2 2 3 8.85pF m 8.2 10 m 140pF. 1.3 10 m R C d  = = = (b) The charge on the positive plate is given by , q C V = , where V is the potential difference across the plates. Thus, ( 29 ( 29 10 8 1.4 10 F 120 V 1.7 10 C. q = = 13. Capacitors 1 C and 2 C are in parallel, so their equivalent capacitance is 12 1 2 15.0?F. C C C = + = That parallel combination is in series with 3 C . The equivalent capacitance of the set of three capacitors is 1 1 123 12 3 1 1 1 1 3.16 F. 15.0 F 4.00 F C C C  = + = + = 15. Let x be the separation of the plates in the lower capacitor. Then the plate separation in the upper capacitor is a b x . The capacitance of the lower capacitor is ....
View
Full
Document
 Spring '08
 Goksu
 Physics, Capacitance

Click to edit the document details