question archive Capacitor 2 has half the capacitance and twice the potential difference as capacitor 1

Capacitor 2 has half the capacitance and twice the potential difference as capacitor 1

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Capacitor 2 has half the capacitance and twice the potential difference as capacitor 1.
What is the ratio Uc1/Uc2.

Where would I start with this problem and what equation would I use?

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Uc = 0.5 * C * V^2

C = Capacitance
V = Potential

Then,
C1 = 2C2

V2 = 2V1

Then (Uc)1/(Uc)2
= (0.5 * C1 * V1^2) / (0.5 * C2 * V2^2)
= 2/4 = 0.5