Determine the energy stored by C4 when C1 = 20 ?F, C2 = 10 ?F, C3 = 14 ?F, C4 = 30 ?F, and V0 = 45 V.
A. 3.8 mJ
B. 2.7 mJ
C. 3.2 mJ
D. 2.2 mJ
E. 8.1 mJ
Answer: D
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A parallel plate capacitor has plates each of area 100 
and with separation 0.25 mm. If this capacitor is charged with 25 pC, what is the average charge density on the positive plate?
a. 
b. 
c. 
d. 
e. 
The diagram below and to the left shows an electron moving to the right in the plane of the drawing. What is the direction of the electron’s magnetic field at points a through g? Answer using the closest choice given on the right (to indicate a double-letter using the back of the book, point to the letter with two fingers). 
A.A B.B C.C D.D E. Toward the viewer F. Away from the viewer T. The field is zero.
If you weighed 800 newtons on Earth, how much would you weigh at 6000 km [one Earth radius] above the surface of Earth?
A) 200 newtons B) 3200 newtons C) 800 newtons D) 1600 newtons E) 400 newtons
Add the following lengths, each obtained from a different measuring instrument, and round the answer to the proper number of significant figures: 20.02 m, 5.91 m, 0.0097 m, and 2.467 m
What will be an ideal response?