From the calculations, the Pd across the capacitors are 360V and 240V respectively.
The capacitor is a device used to store charges. Since the charge for capacitors in series is the same;
1/C = 1/20 + 1/30 = 0.05 + 0.033
C = 12 * 10^-3 F
Q = 12 * 10^-3 F * 600 V
Q = 7.2 C
Voltage across the 20mf capacitor = 7.2 C/20 * 10^-3
= 360 V
Voltage across the 30mf capacitor = 7.2 C/30 * 10^-3
=240 V
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