Two $2\mathrm{.}10$ cmcm $2\mathrm{.}10$ cmcm plates that form a parallel$-$plate capacitor are charged to $0\mathrm{.}712$ nCnC$.$

Part A

What is the potential difference across the capacitor if the spacing between the plates is $0\mathrm{.}900$ mmmm$?$

Express your answer with the appropriate units.

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Part B

What is the potential difference across the capacitor if the spacing between the plates is $1\mathrm{.}80$ mmmm$?$