P26_043 - 43. (a) The electric eld in the region between...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
43. (a) The electric feld in the region between the plates is given by E = V/d ,where V is the potential diFerence between the plates and d is the plate separation. The capacitance is given by C = κε 0 A/d , where A is the plate area and κ is the dielectric constant, so d = κε 0 A/C and E = VC κε 0 A = (50 V)(100 × 10 12 ±) 5 . 4(8 . 85 × 10 12 ± / m)(100 × 10 4 m 2 ) =1 . 0 × 10 4 V / m . (b) The ²ree charge on the plates is q f = CV = (100 × 10 12 ±)(50 V) = 5 . 0 × 10 9 C. (c) The electric feld is produced by both the ²ree and induced charge. Since the feld o² a large uni²orm layer o² charge is q/ 2 ε 0 A , the feld between the plates is E = q f 2 ε 0 A + q f 2 ε 0 A q i 2 ε 0 A q i 2 ε 0 A , where the frst term is due to the positive ²ree charge on one plate, the second is due to the negative
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.

Ask a homework question - tutors are online