When a capacitor has a charge of magnitude 80 mC on each plate the potential difference across the plates is 16 V. How much energy is stored in this capacitor when the potential difference across its plates is 42 V?
a. 1.0 mJ
b. 4.4 mJ
c. 3.2 mJ
d. 1.4 mJ
e. 1.7 mJ
Question 2
A 4.0-mF capacitor initially charged to 50 V and a 6.0-mF capacitor charged to 30 V are connected to each other with the positive plate of each connected to the negative plate of the other. What is the final charge on the 6.0-mF capacitor?
a. 20 mC
b. 8.0 mC
c. 10 mC
d. 12 mC
e. 230 mC
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