(ii)The capacitor voltages at 4 s are the same as at 5 s since the current source value
is zero after 3 s. Therefore, the stored energy in various capacitors can be
calculated using the voltage values.
Stored energy in C
1
0.5 6 6.5
2
J 126.75 J.
Stored energy in C
2
0.5 3 4.5
2
J 30.375 J.
Stored energy in C
3
0.5 3 4.5
2
J 30.375 J.
Total stored energy 187.5 J.
(iii) The initial charge in C
1
was 30 C and in C
2
// C
3
was 18 C. Thus, initial charges in
the two capacitors in series combination were not equal. Hence, there will be
trapped energy in the system. Initial stored energy 0.5 6 5
2
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