Physics quiz question: capacitors in series

Physics 205B Quiz 5, spring semester 2012
Cuesta College, San Luis Obispo, CA

Cf. Giambattista/Richardson/Richardson, Physics, 2/e, Problem 18.49(c)

An ideal 25 V emf source is connected to two ideal capacitors, as shown at right. After the capacitors are fully charged, the __________ capacitor has a greater charge.
(A) 10 nF.
(B) 18 nF.
(C) (There is a tie.)
(D) (Not enough information is given.)

Correct answer: (C)

The two capacitors are in series with each other, such that there is the same amount of charge Q stored in either capacitor.

Section 30882
Exam code: quiz05Vo7x
(A) : 12 students
(B) : 9 students
(C) : 5 students
(D) : 0 students

Success level: 19%
Discrimination index (Aubrecht & Aubrecht, 1983): 0.50