A 15-?F capacitor is charged to 40 V and then connected across an initially uncharged 25-?F capacitor. What is the final potential difference across the 25-?F capacitor?
A. 12 V
B. 18 V
C. 15 V
D. 21 V
E. 24 V
Answer: C
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What do we mean when we say that a magnetic field has polarity?
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