A 1.2 mu F capacitor is charged to 30 V. After charging, the capacitor is discon
ID: 1998007 • Letter: A
Question
A 1.2 mu F capacitor is charged to 30 V. After charging, the capacitor is disconnected from the voltage source and is connected across the terminals of a second capacitor that had previously been discharged. The final voltage across the 1.2 mu F capacitor is 10 V. a) What is the total charge before the two capacitors are connected together? b) Are the capacitors connected in series or parallel? c) Compared to the result in question a) the total charge of the capacitor combination after they are connected together should A) increase. B) decrease. C) stay the same. d) What is the capacitance of the second capacitor? e) How much energy was dissipated when the connection was made?Explanation / Answer
a) q1 = CV = 30*1.2
= 36 uC
b) parallel
c) remains same.
d) 36 = CV
36= 10 C
C = 3.6
C2=C-C1 = 3.6-1.2 = 2.4 uF
e) energy dissipated = 0.5*1.2*30^2 - 0.5*3.6*10^2
= 360 J Answer
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