Question on: JAMB Physics - 1999
A
3.0 x 104J
B
3.0 x 102J
C
2.5 x 10-2J
D
6.0 x 10-3J
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Correct Option: C
Energy stored in a capacitor is given by
E = 1/2CV2
But effective capacitance for the parallel arrangement is given by
C = C1 + C2
= 2 + 3
= 5μF = 5 x 10-6 x (100)2
∴E = 1/2CV2
= 1/2 x 5 x 10-6 x 104
2.9 x 10-2J
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