Two capacitors of capacitance 600 pF and 900 pF are connected in series across a 200 V supply. Calculate (i) the effective capacitance of the combination, (ii) the pd across each capacitor and (iii) the total charge stored in the system.

Explanation

`C_(eff) = (C_1C_2)/(C_1 + C_2)`
` = (600 xx 900)/(600 + 900) = 540000/1500`
`C_(eff) = 360 pF`
` Q = CV = 360 xx 200`
`Q = 72 nC`
`V_1 = (Q)/(C_1) = 120 V`
`V_1 = (Q)/(C_2) = 80 V`