19. (a) After the switches are closed, the potential differences across the capacitors are the same and the two capacitors are in parallel. The potential difference from ato bis given by Vab= Q/Ceq, where Qis the net charge on the combination and Ceqis the equivalent capacitance. The equivalent capacitance is Ceq= C1+ C2= 4.0 ×10–6F. The total charge on the combination is the net charge on either pair of connected plates. The charge on capacitor 1 is ( )( )64111.0 10 F 100V1.0 10 CqCV−−==×=×
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This note was uploaded on 01/25/2011 for the course PHYS 121 taught by Professor Iy during the Spring '10 term at The Petroleum Institute.