Two capacitors rated 600 pF, 4kV and 300 pF, 6kV can work in series up to the potential of 
a) 10 kV
b) 9 kV
c) 6 kV
d) 4 kV

Dear Student,

Charge on each capacitor,using Q=CVQ1=2.4 μC   Q2=1.8  μCSo these are the maximum allowed charge in each capacitor beyond which the capacitor will break.In series the charge is common for both capacitor.so maximum charge that is within safe limit for both=1.8 μCCeq=C1C2C1+C2200 pFor, V=QCeq1.8 ×10-62×10-10=9 kV
Regards.

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