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Earlier discussion
2 older comments kept for context.
Idris Busari
Using the relation,
W = 1/2 CV²
= 1/2 × (20 × 10⁻⁶) × (10³)²
= 1/2 × 20 × (10⁻⁶ × 10⁶)
= 20/2
= 10.0J
David Gomba
W = 1/2CV²
W = 20 x 100²/2
W = 20 x 10000/2 = 100000
To convert from microfarad(uf) u multiply by 10\(^{-6}\)
I. E 100000 x 10\(^{-6}\) = 0.1
Therefore 0.10J is the correct answer.