الفيزياء العامة الجزء الثاني#موقع الفيزياء.كوم

Multiple choice question for part 2
[1] (a) How much charge is on a plate of a 4.00F capacitor when it is
connected to a 12.0 V battery? (b) If this same capacitor is connected to a
1.50 V battery, what charge is stored?
a. (a) 3.00 C; (b) 2.67 C
b. (a) 3.00 C; (b) 0.375 C
c. (a) 0.333 C; (b) 2.67 C
d. (a) 48.00 C; (b) 6.00 C
[2] Calculate the equivalent capacitance between points a and b in Figure 1.
a
3uF
1uF
7uF
3uF
Figure 1
Note that this is not a simple series or parallel combination. (Hint: Assume a
potential difference V between points a and b. Write expressions for V ab
in terms of the charges and capacitances for the various possible pathways
from a to b, and require conservation of charge for those capacitor plates that
are connected to each other.)
a. 4.68 F
b. 15.0 F
c. 0.356 F
d. 200 F
[3] Two capacitors C l = 27.0 F and C 2 = 7.00 F, are connected in parallel
and charged with a 90.0 V power supply. (a) Calculate the total energy
stored in the two capacitors. (b) What potential difference would be required
across the same two capacitors connected in series in order that the
combinations store the same energy as in (a)?
a. (a) 0.0225 J; (b) 25.7 V
b. (a) 0.0225 J; (b) 36.4 V
c. (a) 0.138 J; (b) 223 V
d. (a) 0.13 8 J; (b) 157 V
1uF
Ab
220
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