chapter25-018 - 18. We determine each capacitance from the...

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18. We determine each capacitance from the slope of the appropriate line in the graph. Thus, C 1 = (12 µ C)/(2.0 V) = 6.0 µ F. Similarly, C 2 = 4.0 µ F and C 3 = 2.0 µ F. The total equivalent capacitance is given by 123 123 1 2 3 1 2 3 11 1 () CCC CC C C C C C + + =+ = ++ , or 12 3 123 (6.0 F)(4.0 F 2.0 F) 36 F3 . 0 F 6 . 0F4 . 0F2 . 0F 1 2 CC C C µ µµ µµµ + + == = = + + . This implies that the charge on capacitor 1 is 1 q = (3.0 µ F)(6.0 V) = 18
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