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Bookmarks People Window Help g.3 99% Mon 12:09 PM cture.com/courses/1118412 018) Assignments HW03 WO3 HW03- Capacitors. Dielectrics and Ohm's law Begin Date: 9/4/2018 1200:00 PM Due Date:9/11/2018 11:59.00 PM End Date: 1:2 1788?module item,Jd-11620512 11:59:00 PM (0%) Problem 7: A parallel-plate capacitor has a capacitance of c,-8Spp when filed with air and e-19 when naled with a dielectric oil at potential difference of 12 V. Take the vacuum permittivity to be .-885 x 10-12 cawm 33% Part (a) Input an expression for the permittivity of the cil e. Gia 33 % Part (b) what is the permittivity of this oil in C2YNmy? 33% Part (c) How much more charge q in C does the capacitor hold when filled with oil relative to when it's filled with air? Dodactions * Previous MacBook Pro 9 0

Explanation / Answer

7)We know that

C = e0 A/d = 8.5 uF

C' = k e0 A/d = 19 uF

C'/C = k e0 (A/d)/e0 (A/d)

k = C'/C

b)k = 19/8.5 = 2.24

Hence, k = 2.24

c)Q = CV = 8.5 x 12 = 102 uC

Q' = C'V = 19 x 12 = 228 uC

delta-q = Q' - Q = 228 uC - 102 uC = 126 uC

Hence, delta-q = 126 uC

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